题目内容

When he was a child, he’s already a confirmed television (addictive) ______.

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泵送混凝土的特点是拌和物的坍落度不小于100mm。( )

A. 对
B. 错

( )外人止步 ( )请勿超过栏杆

Ten years ago she could not have ______ (see) that her marriage would end in divorce.

水泥比表面积测定方法中使用的勃氏透气仪主要由U形压力计、透气圆筒、抽气装置三部分组成。( )

A. 对
B. 错

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