【判断题】【消耗次数：1】
若点（<img class=jc-formula data-tex={ x }_{ 0 },{ y }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/B9C134F4CF36B2874F692A17C279CAA9.png style=vertical-align: middle;/>）为曲线y=<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>的拐点，则点x=<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>一定不是函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>的极值点。
①
正确
②
错误
参考答案：
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相关题目
【单选题】
设<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>处可导，则<img class=jc-formula data-tex=\lim _{ h\rightarrow 0 }{ \frac { f\left( { x }_{ 0 }-h \right) -f\left( { x }_{ 0 } \right) }{ h } } = src=https://huaweicloudobs.ahjxjy.cn/114D1182A572A98FFD54B6C4066BEC8A.png style=vertical-align: middle;/>( ).
①
2<img class=jc-formula data-tex=f^{ \prime }\left( { x }_{ 0 } \right) src=https://huaweicloudobs.ahjxjy.cn/B5876FA4E8E95C0AB96A2BDEDFEBD976.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=f^{ \prime }\left( { x }_{ 0 } \right) src=https://huaweicloudobs.ahjxjy.cn/B5876FA4E8E95C0AB96A2BDEDFEBD976.png style=vertical-align: middle;/>
③
-<img class=jc-formula data-tex=f^{ \prime }\left( { x }_{ 0 } \right) src=https://huaweicloudobs.ahjxjy.cn/B5876FA4E8E95C0AB96A2BDEDFEBD976.png style=vertical-align: middle;/>
④
不存在
【判断题】
若点（<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>，<img class=jc-formula data-tex={ y }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/FDC845F2DA32A74FC2F20A14C6E5190E.png style=vertical-align: middle;/>）为曲线<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>的拐点，则点<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>必是函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>二阶导数为零的点。
①
正确
②
错误
【单选题】
设<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>可导，则它在该点处（ ）
①
不一定连续
②
未必有定义
③
一定连续
④
不一定可微
【单选题】
若函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在x=0处连续，下列命题错误的是（ ）
①
若<img class=jc-formula data-tex=\lim _{ x\rightarrow 0 }{ \frac { f\left( x \right) }{ x } } src=https://huaweicloudobs.ahjxjy.cn/C8AE2FB4DAD2E1633554A1E2B2240216.png style=vertical-align: middle;/>存在，则f(0)=0.
②
若<img class=jc-formula data-tex=\lim _{ x\rightarrow 0 }{ \frac { f\left( x \right) +f(-x) }{ x } } src=https://huaweicloudobs.ahjxjy.cn/F0F8528CE8291C7DF70ACA16E6A29471.png style=vertical-align: middle;/>存在，则f(0)=0.
③
若<img class=jc-formula data-tex=\lim _{ x\rightarrow 0 }{ \frac { f\left( x \right) }{ x } } src=https://huaweicloudobs.ahjxjy.cn/C8AE2FB4DAD2E1633554A1E2B2240216.png style=vertical-align: middle; width: 105px; height: 60px; width=105 height=60/>存在，则<img class=jc-formula data-tex=f^{ \prime }\left( 0 \right) src=https://huaweicloudobs.ahjxjy.cn/1018EF9D0A43F63B24E7946CC8B9BF4C.png style=vertical-align: middle;/>存在。
④
若<img class=jc-formula data-tex=\lim _{ x\rightarrow 0 }{ \frac { f\left( x \right) +f(-x) }{ x } } src=https://huaweicloudobs.ahjxjy.cn/F0F8528CE8291C7DF70ACA16E6A29471.png style=vertical-align: middle;/>存在，则<img class=jc-formula data-tex=f^{ \prime }\left( 0 \right) src=https://huaweicloudobs.ahjxjy.cn/1018EF9D0A43F63B24E7946CC8B9BF4C.png style=vertical-align: middle;/>=0.
【单选题】
若<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex=\left[ a,b \right] src=https://huaweicloudobs.ahjxjy.cn/F7E2D96607BB44F0EF21CEDD74AA3D39.png style=vertical-align: middle;/>上具有三阶连续导数，且在<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/><img class=jc-formula data-tex=\in \left( a,b \right) src=https://huaweicloudobs.ahjxjy.cn/54137EDF9AAE8C8988D2FF58BF9DBCD7.png style=vertical-align: middle;/>处，<img class=jc-formula data-tex=f^{ \prime }\left( { x }_{ 0 } \right) =f^{ \prime \prime }\left( { x }_{ 0 } \right) =0,f^{ \prime \prime \prime }\left( { x }_{ 0 } \right) \neq 0 src=https://huaweicloudobs.ahjxjy.cn/4EF25EC447EF6656029CF6BFD0E35F6F.png style=vertical-align: middle;/>,则（ ）
①
<img class=jc-formula data-tex=({ x }_{ 0 },f\left( { x }_{ 0 } \right) ) src=https://huaweicloudobs.ahjxjy.cn/A109C23827EC4A2A05876E108321A4C0.png style=vertical-align: middle;/>必是拐点<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=({ x }_{ 0 },f\left( { x }_{ 0 } \right) ) src=https://huaweicloudobs.ahjxjy.cn/A109C23827EC4A2A05876E108321A4C0.png style=vertical-align: middle;/>不是拐点
③
<img class=jc-formula data-tex=({ x }_{ 0 },f\left( { x }_{ 0 } \right) ) src=https://huaweicloudobs.ahjxjy.cn/A109C23827EC4A2A05876E108321A4C0.png style=vertical-align: middle;/>必为极值点
④
以上三者均不对
【单选题】
函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在点<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>处有极限是其在该点处连续的（ ）
①
充分条件
②
必要条件
③
充分必要条件
④
无关条件
【判断题】
若函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在点<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>左右两侧二阶导数符号相反，则函数在<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>处必有拐点。
①
正确
②
错误
【单选题】
若函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex=\left[ a,b \right] src=https://huaweicloudobs.ahjxjy.cn/F7E2D96607BB44F0EF21CEDD74AA3D39.png style=vertical-align: middle;/>上连续，在（a,b）内可导，则下列说法错误的是（ ）
①
<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex=\left[ a,b \right] src=https://huaweicloudobs.ahjxjy.cn/F7E2D96607BB44F0EF21CEDD74AA3D39.png style=vertical-align: middle;/>上必有最大值和最小值
②
<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在<img class=jc-formula data-tex=\left[ a,b \right] src=https://huaweicloudobs.ahjxjy.cn/F7E2D96607BB44F0EF21CEDD74AA3D39.png style=vertical-align: middle;/>上一定有界
③
在（a,b）内必存在一点<img class=jc-formula data-tex=\xi src=https://huaweicloudobs.ahjxjy.cn/C2EDB2E335663DD9541AAD0FF4E4B826.png style=vertical-align: middle;/>,使得<img class=jc-formula data-tex=f^{ \prime }\left( \xi \right) src=https://huaweicloudobs.ahjxjy.cn/204E96EBEC63053ACBC2253BD6B9D85B.png style=vertical-align: middle;/>=0.
④
在（a,b）内必存在一点<img class=jc-formula data-tex=\xi src=https://huaweicloudobs.ahjxjy.cn/C2EDB2E335663DD9541AAD0FF4E4B826.png style=vertical-align: middle;/>,使得<img class=jc-formula data-tex=f^{ \prime }\left( \xi \right) src=https://huaweicloudobs.ahjxjy.cn/204E96EBEC63053ACBC2253BD6B9D85B.png style=vertical-align: middle;/>=<img class=jc-formula data-tex=\frac { f\left( b \right) -f\left( a \right) }{ b-a } src=https://huaweicloudobs.ahjxjy.cn/53BB4FA3DDA3CF0DCED2782518945E4C.png style=vertical-align: middle;/>.
【判断题】
函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在区间I上的一个原函数称为<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在I上的不定积分。
①
正确
②
错误
【单选题】
设在x=0的某领域内连续，且<img class=jc-formula data-tex=\lim _{ x\rightarrow 0 }{ \frac { f\left( x \right) }{ \ln { (2-\cos { x) } } } =2 } src=https://huaweicloudobs.ahjxjy.cn/B7FBF4F4EA8DE3EBAD15010C8F45EA22.png style=vertical-align: middle;/>,则在x=0处<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>（ ）
①
不可导
②
可导，且<img class=jc-formula data-tex=f^{ \prime }\left( 0 \right) \neq 0 src=https://huaweicloudobs.ahjxjy.cn/E3723D58E8A892805FC0989F8A9BF478.png style=vertical-align: middle;/>
③
取极大值
④
取极小值
随机题目
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[set off; after all; attach to; burst into laughter; lean against; teach...a lesson; take off; come to sense; give in to]3. When I say to[填空1]in military language, you know what that means!
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[chore; talent; crowded; earnings; finance; festive; memorable; sacrifice; smash; reproduction]2. A[填空1]is a copy of something such as a piece of furniture or a work of art.
【简答题】
Directions: Fill in the blanks with the words given below. Change the form if necessary.(pros and cons; allocation; update; complexity; infancy; initially; minimal;strategically; grab; digest)4. Do you have the[填空1]yet?
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[collide with; take hold of; for a moment; head for; ever since; be full of; share with; make fun of]1. Ann had lived in a cottage[填空1]she was born, and had no wish to move to a tower block.
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[sell out; in other words; consist of; stand for; rely on; demand for; engage in; at hand; yield to; confront with]1. They have[填空1]of the brand that I like.
【简答题】
Directions: Translate sentence by using “nothing more than”.4. We ______________(意思只不过是说). This is the usual condition of things on our earth.
【简答题】
Translate the following sentence into English.这是一次重要的会议，请务必不要迟到。
【简答题】
Translate the following sentence into English.老师要求她这个学期要投入到学习之中。
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[have access to; go off; desperate for; put up with; always the case; give advice; concentrate on; arrive at; make an effort; come in handy]1. We may[填空1], but we cant give conduct.
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[assumption; contact; cliff; equivalent; emergency; outweigh; height; rummage; vibration; bugbear]5.Even the cheapest car costs the[填空1]of 7 yearssalary for a government worker.