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问题 单项选择题

待混凝土强度达到设计强度的( )，方可放松预应力筋。

A．60%

B．75%

C．80%

D．90%

答案

参考答案：B

解析：根据规范规定，混凝土的强度达到设计强度的75%，方可张拉和放松预应力筋

选择题
满足
Cx2-3x14
=C142x-6的x的值是（　　）
A．2和3B．2，3和5C．3和5D．只有3
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完形填空

用所给词的适当形式填空 (10)

小题1:---Where did you______ (study) last night?

---No, I__________(help)my mother_______(clean) the room.

小题2:Mike goes to see his grandparents _________(one) a week.

小题3:To keep healthy，I decide _______ (exercise) half an hour every day

小题4:He is         (funny) than the other students in his class.

小题5:The boy enjoys         (swim) very much.

小题6:His mother often makes him       (clean) his room on weekends.

小题7:It’s necessary for us         (learn) English well.

小题8:I’m           (good) at physics than my sister.

小题9:Dumpling House is          (cheap) restaurant in the city.

小题10:I think Xi Yangyang is as         (famous) as Mikey Mouse.

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