单项选择题
对泵送混凝土,碎石最大粒径与输送管内径之比,宜小于等于(),卵石宜小于等于()
A.1:3/1:2.5
B.1:1.5/1:2
C.1:2/1:2.5
D.1:2.5/1:2
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单项选择题
A.1:3/1:2.5
B.1:1.5/1:2
C.1:2/1:2.5
D.1:2.5/1:2