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【单选题】
进行初步计算配合比设计时，用来确定砂、石用量的体积法假定主要是指()A.
假定混凝土拌合物的体积等于各组成材料的体积与拌合物中所含空气的体积之和
B.
假定混凝土拌合物的体积等于各组成材料的体积与拌合物中所含水的体积之和
C.
假定混凝土拌合物的体积等于各组成材料的体积与拌合物中所含空气的体积之差
D.
假定混凝土拌合物的体积等于各组成材料的体积与拌合物中所含水的体积之差
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