【单选题】【消耗次数：1】
下列结论正确的是
①
反对称矩阵主对角线上的元素全为零
②
对称矩阵主对角线上的元素必全为零
③
反对称矩阵主对角线上的元素不一定等于零
④
对称阵一定不等于反对称阵
参考答案：
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相关题目
【多选题】
设A为n阶对称矩阵，B为n阶反对称矩阵，则下列是对称矩阵的是
①
<img class=jc-formula data-tex={ A }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/CC624A823BD8B73F0E774F3692397F09.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ B }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/192A9F0679D608F98C34169BD9A4F824.png style=vertical-align: middle;/>
③
AB-BA
④
AB+BA
随机题目
【单选题】
The adviser recommended that Mary _____ the training program as soon as possible.
①
started
②
starts
③
start
④
would start
【单选题】
The computer doesn’t work well, so something _________ wrong.
①
can have gone
②
should have gone
③
must have gone
④
ought to have gone
【单选题】
He made a mistake, but then he corrected the situation it got worse.
①
until
②
when
③
before
④
as
【单选题】
Please help yourself to the fish.
①
Thanks, but fish doesn’t agree with me
②
Sorry, I can’t help
③
I don’t like fish
④
No, I can’t
【单选题】
The reason _________ I am writing this letter is to tell you about the meeting on Saturday.
①
because
②
why
③
for
④
as
【单选题】
Is that Mr Robert Lee?
①
Yes, Lee speaking
②
Hello, what do you want
③
Sorry, speaking
④
I don’t know
【单选题】
Hello, is that Shanghai Airlines?
①
Yes, can I help you?
②
Yes, what do you want?
③
Yes, you’re right
④
Yes, right number
【单选题】
May I see the menu, please?
①
That is the menu, sir
②
Yes, please go on
③
Here you are, sir
④
Of course, sir
【单选题】
__________ a teacher in a university, it is necessary to have at least a master’s degree.
①
To become
②
Become
③
One becomes
④
On becoming
【单选题】
May I see your tickets and passports, please?
①
No, you can’t
②
Yes, you can
③
here they are
④
No, they are mine