單項選擇題建設(shè)用砂的氯化物含量(以氯離子質(zhì)量計)應(yīng)?。ǎ┰囼灲Y(jié)果的算術(shù)平均值,精確至()

A.2次,0.01%
B.2次,0.1%
C.3次,0.01%
D.3次,0.1%


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