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[填空题]
《GB175-1999》、《GB1344-1999》、《GB12958-1999》规定的六大水泥强度龄期均为()天和()天。
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《GB175-1999》中普通硅酸盐水泥的强度等级分为()。
A.32.32.5R。42.42.5R。52.52.5R
B.42.42.5R。52.52.5R。62.62.5R
C.27.27.5R。32.32.5R。42.42.5R
A.32.5,32.5R。42.5,42.5R。52.5,52.5R
B.42.5,42.5R。52.5,52.5R。62.5,62.5R
C.27.5,27.5R。32.5,32.5R。42.5,42.5R
根据《GB175-1999》的规定,在某水泥编号中随机抽取了20袋水泥,每袋分别称量,20袋总重为998.0kg,其中单袋净重大于49.8kg的为18袋,则此次袋重抽查的合格率为90%。()