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采用代用法中的不变用水量法进行水泥标准稠度用水量试验时，采用142.5ml水进行搅拌，下沉深度为19mm时，计算标准稠度用量（）。
A . 26.9%
B . 31.9%
C . 27.9%
D . 29.9%
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