问题
单项选择题
用于大体积混凝土或长距离运输的混凝土常用的外加剂是( )。
A．早强剂
B．缓凝剂
C．减水剂
D．引气剂
答案
参考答案：B
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用于大体积混凝土或长距离运输的混凝土常用的外加剂是( )。
A．早强剂
B．缓凝剂
C．减水剂
D．引气剂
参考答案：B
| 选词填空。 | |
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