题目内容

2、梁跨度等于及大于（）m时，底模应起拱。

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混凝土结构施工时，对模板有三个方面的要求，分别是什么？

模板配置的原则有哪些?

Which of these words almost always have a weak pronunciation? (select all that are correct)

A. a
B. of
C. can't
D. and

Can is usually unstressed when _________.

A. when another word follows it in a sentence.
B. it is at the end of a sentence.