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【单选题】
提高混凝土拌合物的流动性，可采取的措施是（）A.
增加单位用水量
B.
提高砂率
C.
增加水灰比
D.
在保持水灰比一定的条件下，同时增加水泥用量和用水量
拍照语音搜题，微信中搜索"皮皮学"使用
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