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【单选题】
Nowadays teenagers like to go to the fast food restaurant, ________, as the name says, eating needn’t take much time.A.
which
B.
however
C.
therefore
D.
where
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举一反三
【多选题】Let A,B,C be n×n matrices, then which of the following statements are correct?
A.
A must be symmetric.
B.
If AB=AC, then B=
C.
If A is nonsingular and AB=O, then B=O.
D.
If A =I, then A-I must be singular.
【简答题】Let A, B and C be square matrices, which of the following statements is true?A. Ax=0 has only the trivial solution if and only if A can be written as the product of elementary matrices. B. Then A is r...
【单选题】 By the way I think it’s better to add ...... here, so that our factory can control the production.
A.
a penalty clause
B.
an insurance clause
C.
a more or less clause here
【简答题】情景对话（共5小题，每小题1分，满分5分） 根据对话情景和内容，从对话后所给的选项中选出能填入每一空白处的最佳选项，并在答题卡上将该选项涂黑。选项中有两个为多余选项。 注意：E涂AB F涂AC G涂AD (Jerry is at a hotel in Xi’an. He is talking to a clerk.) Clerk: What can I do for you, sir...
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