题目内容

扭转实验得到的力学性能指标τp代表什么？

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扭转实验得到的力学性能指标τs代表什么？

扭转实验得到的力学性能指标τb代表什么？

下列判断错误的是( )

A. 向量组的部分组相关,则向量组整体相关
B. 向量组整体无关,则任意部分组无关
C. 含有零向量的向量组必线性相关
D. 任意向量组都存在最大无关组

Dialogue 1G: Good afternoon. I’m Elizabeth Lynne. I just got to Hangzhou from Singapore. (1 ) .R: Welcome to Hangzhou. Let me see. Miss Lynne. (2)G: Yes, of course.R: Is that a double room?G: I am afraid not. Yes, here, ( 3 ).R: All right. Let me see. (4 )?G: Ok, no problem.R: Yes, I got your room. And Miss Lynne, ( 5 )?G: How about traveler’s cheques?R: Sure, thanks!G: You’re welcome.50

A. I made a reservation before my trip.
B. I made a reserve before my trip.
C. I booked a room before my trip.
D. I made a call before my trip.