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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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