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【多选题】
有关砌筑用砂浆,下列描述正确的是( )。A.
砂宜用过筛中砂
B.
配合比用重量比
C.
蒸压粉煤灰砖墙用的砂浆稠度为60~70mm
D.
砂浆拌制后5h内用完
E.
拌制水泥砂浆时，砂的含泥量不大于5%
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