【单选题】【消耗次数：1】
We should make a clear ____ between the two scientific terms for the purpose of our discussion.
①
separation
②
discrimination
③
deviation
④
distinction
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相关题目
【单选题】
The leakage of the concrete ( ) of the contract between the two corporations has aroused much concern and a heated discussion in local residents.
①
portions
②
divisions
③
fragments
④
details
【单选题】
To make this ____ clear we shall have to look closely
into biology’s long history.
①
distinction
②
indication
③
recognition
④
constitution
【单选题】
To make this _____clear we shall have to look closely into biology’s long history.
①
distinction
②
indication
③
recognition
④
constitution
【单选题】
______ the storm, we should have reached our company.
①
Because of
②
In spite of
③
In case of
④
But for
【单选题】
This is a _____ moment for our research. We should be careful.
①
critical
②
belt
③
conscience
④
copper
【单选题】
Don’t _______ our hopes. As long as we pull together, we’ll make it.
①
give up
②
give out
③
give back
④
give away
【单选题】
We should be pleased to send you some samples of our new printers on approval, _______ our own expenses.
①
at
②
on
③
for
④
in
【单选题】
As a freshman, we should get to know campus ( ) as soon as possible and make good use of them.
①
Source
②
sources
③
resource
④
resources
【单选题】
Would you like to ______us in our discussion.
①
take part in
②
join
③
taking part in
④
joining
【单选题】
To step up the trade, we______ our end-users, make counter-offers as below.
①
and
②
on behalf of
③
with
④
from
随机题目
【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/DF8F69F655E78E4135AC3021CDC7271E.png title=1.png alt=1.png/><img src=https://huaweicloudobs.ahjxjy.cn/F7917C42483D4B4EB3AFA503705443DE.png title=7.png alt=7.png/><img src=https://huaweicloudobs.ahjxjy.cn/77F20DCCE4501B2AF8CE94213944843F.png title=9.png alt=9.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/031AF786D9AAFDC6194CB49BCD33E128.png title=3.png alt=3.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/FBC5ADDF51D26212F24F96E31FA8311B.png title=4.png alt=4.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/3483CF233B84B6DAFCB8829133112C52.png title=5.png alt=5.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/311A417933B9B3EBA7EC103876394643.png title=6.png alt=6.png/>
【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/084C84E1F80AD269079ECEAD350F1C75.png title=9.png alt=9.png/>下列选项中成立的是
①
<img src=https://huaweicloudobs.ahjxjy.cn/7CC40E9BCFCFC4C32B013C4501F7C679.png title=10.png alt=10.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/7B35C76CA56BBC26D68FE7A1D9838E44.png title=11.png alt=11.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/4CB69739C0298A483A2386932DC23A5A.png title=12.png alt=12.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/197F2116F7CD013979580BD551F44D01.png title=13.png alt=13.png/>
【多选题】
关于矩阵的初等变换，下列说法正确的是
①
对单位矩阵<img class=jc-formula data-tex=I src=https://huaweicloudobs.ahjxjy.cn/ED8D7BAC3C43D7E580A0675D627782A3.png style=vertical-align: middle;/>施以一次初等变换得到的矩阵称为初等矩阵。
②
对单位矩阵<img class=jc-formula data-tex=I src=https://huaweicloudobs.ahjxjy.cn/ED8D7BAC3C43D7E580A0675D627782A3.png style=white-space: normal; vertical-align: middle;/>施以若干次初等变换得到的矩阵称为初等矩阵。
③
对<img class=jc-formula data-tex={ A }_{ m\times n } src=https://huaweicloudobs.ahjxjy.cn/2BAEBF75362B96174C8EECCA5C4250B2.png style=vertical-align: middle;/>的行施以一次某种初等变换得到的矩阵，等于用同种的<img class=jc-formula data-tex=m src=https://huaweicloudobs.ahjxjy.cn/784E6CE9CF3AD22AA457C61FD08A3245.png style=vertical-align: middle;/>阶初等矩阵左乘<img class=jc-formula data-tex={ A }_{ m\times n } src=https://huaweicloudobs.ahjxjy.cn/2BAEBF75362B96174C8EECCA5C4250B2.png style=white-space: normal; vertical-align: middle;/>。
④
对<img class=jc-formula data-tex={ A }_{ m\times n } src=https://huaweicloudobs.ahjxjy.cn/2BAEBF75362B96174C8EECCA5C4250B2.png style=white-space: normal; vertical-align: middle;/>的列施以一次某种初等变换得到的矩阵，等于用同种的<img class=jc-formula data-tex=n src=https://huaweicloudobs.ahjxjy.cn/11056C1B8875D4D8E374CB0C6A7248B5.png style=vertical-align: middle;/>阶初等矩阵右乘<img class=jc-formula data-tex={ A }_{ m\times n } src=https://huaweicloudobs.ahjxjy.cn/2BAEBF75362B96174C8EECCA5C4250B2.png style=white-space: normal; vertical-align: middle;/>。
【判断题】
矩阵一定是由<img class=jc-formula data-tex={ n }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/8FA7EB8A2BBA63FE09A4C72BF07E280C.png style=vertical-align: middle;/>个数<img class=jc-formula data-tex={ a }_{ ij } src=https://huaweicloudobs.ahjxjy.cn/3742D6F739921503A006796B02D4407F.png style=vertical-align: middle;/><img class=jc-formula data-tex=(i=1,2,\cdots ,n;j=1,2,\cdots ,n) src=https://huaweicloudobs.ahjxjy.cn/DD187CD264F30FB41ECE783EBD3C4E7E.png style=vertical-align: middle;/>按一定次序排列成的一个<img class=jc-formula data-tex=n src=https://huaweicloudobs.ahjxjy.cn/11056C1B8875D4D8E374CB0C6A7248B5.png style=vertical-align: middle;/>行<img class=jc-formula data-tex=n src=https://huaweicloudobs.ahjxjy.cn/11056C1B8875D4D8E374CB0C6A7248B5.png style=vertical-align: middle;/>列的矩形表。
①
正确
②
错误
【多选题】
下列说法正确的是
①
<img src=https://huaweicloudobs.ahjxjy.cn/D36A7587328B1EA699198DECEEAE576C.png title=1.png alt=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/88E410F8ED794D954D247749AB58A2E1.png title=2.png alt=2.png/><img src=https://huaweicloudobs.ahjxjy.cn/38C8DB5CE876CCE50E7C63596BC50A14.png title=4.png alt=4.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/88E410F8ED794D954D247749AB58A2E1.png title=2.png alt=2.png/><img src=https://huaweicloudobs.ahjxjy.cn/ED327D8DDEFFD51DE178BE7AB3176BFE.png title=3.png alt=3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/4F6B5F91E3DE712C82A91493BB249EA6.png title=5.png alt=5.png/>
【多选题】
关于分块矩阵，下列说法正确的是
①
一个矩阵可以根据需要写成不同的分块矩阵。
②
一个矩阵只能有唯一的分块方式。
③
分块矩阵运算时把子块作为行列式处理。
④
分块矩阵运算时把子块作为元素处理。
【判断题】
行列式的余子式和代数余子式的关系为<img src=https://huaweicloudobs.ahjxjy.cn/9AE5FA837D955FD8A7102A6B6DFF4863.png title=8.png alt=8.png/>。
①
正确
②
错误