对硅酸盐水泥的分类,下列选项正确的是( )。

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问题 对硅酸盐水泥的分类,下列选项正确的是(    )。

选项 A、42.5,42.5R,52.5,52.5R,62.5
B、32.5,32.5R,42.5,42.5R,52.5,52.5R
C、42.5,42.5R,52.5,52.5R,62.5,62.5R
D、32.5,32.5R,42.5,42.5R,52.5,52.5R,62.5,62.5R

答案C

解析
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