其他条件相同时，预应力混凝土构件的延性比普通混凝土构件的延性_爱下问搜题

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问题单项选择题

其他条件相同时，预应力混凝土构件的延性比普通混凝土构件的延性( )

A．相同
B．大些
C．小些
D．大很多

答案

参考答案：C

解析：本题主要考查的知识点为预应力混凝土构件的特点。
[要点透析] 由于预应力混凝土能延迟裂缝的出现和开展，并且受弯构件要产生反拱，因而可以减小受弯构件在荷载作用下的挠度，所以预应力构件的刚度较大，从而延性较小。

完形填空

完形填空。
Two weeks before Christmas , I went 1 London with my mother. I shall never forget the day. The streets were 2 people. The shop windows were very bright. 　　My mother held my hand and we both went into a toy shop. The shop was full of 3 . There were nice toys 4 . Then I saw Father Christmas himself! I pulled my mother 5 the hand. " Please 6 me to Father Christmas, I said. There were 7 children near Father Christmas. They were standing 8 line. Father Christmas spoke to every one of them. At last it was my 9 . "Hello, little Tom," he said to me. As soon as I heard his 10 ,I found out that he was my uncle, John Smith.
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判断题

用绿灯监视跳闸回路是否正常。