单选:以下哪个代号不是新标准(GB175—1999)对水泥强度进行分级的代号()。A.32.5B.42.5C.42.5RD.425

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题目内容:
以下哪个代号不是新标准(GB175—1999)对水泥强度进行分级的代号()。
A.32.5
B.42.5
C.42.5R
D.425
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