日本的PC主要应用在装配式框架结构，采用（）方式压接，属装配速

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问题单项选择题

日本的PC主要应用在装配式框架结构，采用（）方式压接，属装配速度快的“干节点”。

A.焊接

B.机械锚固

C.预应力

D.灌浆

答案

参考答案：C

选择题

— Li Zhai has been watching the Korean TV series Temptation of Wife the whole night.

— ________. [ ]

A. So her parents have

B. So have been her parents

C. Her parents have been so

D. So have her parents

单项选择题

一个圆形若半径增大到原来的1.5倍，则面积是原来的（）倍。

A.1.5

B.2

C.2.25

D.1.5π