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【单选题】
某混凝土设计要求混凝土拌合物坍落度为130mm,已知坍落度为90mm时,单位用水量为195kg,则该混凝土的单位用水量为( )。
A.
195 kg/m3
B.
200 kg/m3
C.
205 kg/m3
D.
210 kg/m3
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