题目内容

当基础底板厚度为450mm，且配置双层钢筋网，那么应每隔m设一个直径为mm的撑脚。

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Questions 17-20 are based on the monologue on the art of apologizing. You now have 20 seconds to read questions 17-20. When we have done something wrong, we should

A. look honest and think over the fault carefully.
B. escape from being disturbed.
C. admit the fault and express the regret.
D. forgive ourselves.

预制混凝土构件厂中，长线台座法生产构件时，可采用或来张拉冷拔钢丝。

室内正常情况下，钢筋混凝土墙板的钢筋保护层应不小于______mm。

后张法中，钢筋束和钢绞线束作预应力筋时，常用的锚具有、、、等。