题目内容

5、抗冻等级是以（)龄期的试件

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2、含气量也是影响混凝土抗冻性的主要因素

A. 对
B. 错

4、抗冻等级F50以上的混凝土简称为抗冻混凝土

A. 对
B. 错

They were_______towards the city.

A. having
B. causing
C. forcing
D. making

It is important that you_______ quickly to whatever is said.

A. respond
B. responded
C. will respond
D. are responding