【单选题】【消耗次数:1】
峰值附着系数对应的滑动率一般出现在(?)。
10%~15%
15%~20%
20%~30%
30%~50%
参考答案:
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相关题目
【单选题】 峰值附着系数对应的滑动率一般出现在()。
①  10%~15%
②  15%~20%
③  20%~30%
④  30%~50%
【单选题】 峰值附着系数所对应的滑动率为_________。
①  10%一下
②  15-20%
③  30-40%
④  100%
【单选题】 已知四点A(10、20、30)、B(30、20、10)、C(10、20、10)、D(20、20、30),则对H面的重影点为______。
①  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE A与D,D点可见
②  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} B与C,B点可见
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④  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} A与C,C点可见
【单选题】 已知三点A(10、20、15)、B(10、0、30)、C(0、10、0),则在坐标面上的点为______。
①  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} A、B、C三点
②  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} B点
③  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} B、C两点
④  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} C点
【单选题】 A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
①  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} 正垂线
②  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} 侧垂线
③  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} 正平线
④  Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:等线; mso-ascii-font-family:等线; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:等线; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:等线; mso-hansi-theme-font:minor-latin; mso-font-kerning:1.0pt;} 铅垂线
【单选题】 设一个关系模式为R(A,B,C),对应的关系内容为R={{1,10,50},{2,10,60},{3,20,72}{4,30,60}},则δB>15(R)的运算结果中具有的元组个数为( )。
①  1
②  2
③  3
④  4
【单选题】 已知点A(20,20,10),点B(20,20,30),则( )产生重影点。
①  在H面
②  在V面
③  在W面
④  不会
【单选题】 纵向附着系数随轮胎滑动率的增大而_________。
①  增大
②  减少
③  先增大后减少
④  先减少后增大
【单选题】 设一个关系模式为R(A,B,C),对应的关系内容为R={{1,10,50}, {2,10,60}, {3,20,72}, {4,30,60}},则δB15(R)的运算结果中具有的元组个数为( )。
①  1
②  2
③  3
④  4
【判断题】 一般内墙抹灰的厚度15~20mm是一次完成的。()
①  正确
②  错误
随机题目
【单选题】 四人独立地破译一份密码,已知各人能译出的概率分别为1/5.1/4.1/3.1/6则密码最终能被译出的概率为( ).
①  1
②  1/2
③  2/5
④  2/3
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/100E1F6F104E065491422A80D4CC8160.png title=题干.png alt=题干.png width=835 height=99 style=width: 835px; height: 99px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/A37BC314181FD92122DC388FC45BC343.png style= title=3.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/E3A84CF6F5E7A4ECDEDF0D332868FA81.png title=1.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/D5E6FBC9D67F1810F3745A7D50A2E3FB.png title=2.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/CC2D38E790013EFF1C56C92C6D8B3858.png title=4.png style=white-space: normal;/>
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/C92407F815151000CA4AC9483911D54B.png title=题干.png alt=题干.png width=820 height=111 style=width: 820px; height: 111px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/2FC74D076255E936F6524710B944EEA3.png style= title=2.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/6BF421D92F29AC09C5AB2BC76A673DF6.png title=3.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/25CAA6A8D5EB3AC996C1B6EBB98815F8.png title=1.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/94164A0E9B1002F4D1358BF875A8EBD2.png title=4.png style=white-space: normal;/>
【单选题】 (X,Y)是二维随机向量,与COV(X,Y)=0不等价的是( ).
①  EXY=EXEY
②  D(X+Y)=DX+DY
③  D(X-Y)=DX+DY
④  X与Y独立
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/89DBC93941E2FAD1D73334961AE19AAC.png title=题干.png alt=题干.png width=731 height=50 style=width: 731px; height: 50px;/>
①  50
②  100
③  120
④  150
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/F34769F580544CC4F837D2409D3C88C1.png title=题干.png alt=题干.png width=820 height=136 style=width: 820px; height: 136px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/58748F0735C46E03B72015E7C0CF02F5.png style= title=1.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/8600C162BDB85BF564DEE9D96CF5FA5B.png title=2.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/622EB727D3D79F0C07651DF85832635D.png title=3.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/073909FF6C006AC6F29262575671F101.png title=4.png style=white-space: normal;/>
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/EA55C60C5EC111CC2EE4EB58B5CF8CFF.png title=题干.png alt=题干.png width=821 height=173 style=width: 821px; height: 173px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/E516827D224C56D6A18DBD6383291705.png style= title=1.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/C4216A2BD2C3D004610836C1440ECE65.png title=3.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/51F6334934E0C4FA20812F52CAEBB084.png title=2.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/58D8007F207C85E2495B6D2D6F73BF8A.png title=4.png style=white-space: normal;/>
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/C0887239F3FA27B85B766A61F5F343DB.png title=题干.png alt=题干.png width=828 height=60 style=width: 828px; height: 60px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/8AF64C29BAB37D99196FCC12CFF23E1C.png style= title=1.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/5631E19015720FE565D7079BAE6633A9.png title=3.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/2104F988AAF71B84CC6A46330A32E207.png title=2.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/9B5F10583D6A30F5960F7A482BDF2450.png title=4.png style=white-space: normal;/>
【单选题】 设A,B为任意两个事件,则事件(AUB)(<img class=jc-formula data-tex=\Omega src=https://huaweicloudobs.ahjxjy.cn/6CE47998CD8FC7F39C9B15F310CFF80F.png style=vertical-align: middle;/>-AB)表示( )
①  必然事件
②  A与B恰有一个发生
③  .不可能事件
④  A与B不同时发生
【单选题】 设A,B为随机事件,则下列各式中不能恒成立的是( ).
①  P(A-B)=P(A)-P(AB)
②  P(AB)=P(B)P(A|B),其中P(B)0
③  P(A+B)=P(A)+P(B)
④  P(A)+P(<img class=jc-formula data-tex=\overline { A } src=https://huaweicloudobs.ahjxjy.cn/36D283232F29E89615F76C135EDD1356.png style=vertical-align: middle;/>)=1