规定各类路面结构层的最小厚度是为了（）。 A．节省路面材料 B_爱下问搜题

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问题多项选择题

规定各类路面结构层的最小厚度是为了（）。

A．节省路面材料

B．确保形成稳定的结构层

C．方便施工操作

D．使各结构层之间联结紧密

E．有利于承受和扩散行车荷载

答案

参考答案：B, C

选择题

— What have they made up their minds to do during the summer vocation?

— They ______ to cycle around the country on their own. [ ]

A. are determined

B. are decided

C. have determined

D. have been decided

填空题

抗体是由____刺激后形成的一类具有与之发生特异性结合的____。