问题描述:
[单选]
对硅酸盐水泥的分类,下列选项正确的是()。
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
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答案解析:无
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