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不定项选择

‏两根材料、长度、截面面积和约束条件都相同的压杆，其临界压力也不一定相同。‎

A．错误
B．正确
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相关考题

单项选择题
Sometimes I feel that being the mother of three small children is like operating a large circus(马戏团)． 21 afternoon last week, my three sons playing peacefully in the back yard ( 院子), 22 the ball from one to another．I jumped at the chance to talk to one of my friends 23 the phone, but before I 24 to the phone, I could tell the boys had begun to quarrel with each other about something．I rushed out to 25 peace,but before I got there Charles had 26 a rock at Mark,and hit him in the eye．By the time I got to the back yard,they had begun to 27 about this．Even David,the oldest boy,who won' t usually fight with anybody about 28 ,was involved(卷入) First,! 29 them stop fighting, and then ! examined Mark' s eye．I decided that it wasn' t going to develop into a black eye, but I felt that they should 30 at least a little for 31 they had done．"I' m going to 32 to your father about this when he comes home tonight,"I said．"He and I will think of how to punish you．"Things were 33 quiet after that for about half an hour, and then Charles 34 a glass in the kitchen,and at almost the same 35 ,Mark fell out of the apple tree．
第（21）题答案
A.Certain
B.A
C.Some
D.One
判断题
制作巧克力乳冻所使用的巧克力不需熔化。
The chocolate used in chocolate custard does not need to be melted.
正确
错误
问答题
板书的功能包括审美激趣、促进理解、有益记忆和（    ）。
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