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[单选题]
在试验室搅拌砂浆时应采用机械搅拌,搅拌时间不少于()
A.60S
B.120S
C.150S
D.180S
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A.60S
B.120S
C.150S
D.180S
第1题
A.20%以上
B.40%
C.30%-70%
D.40%-80%
第4题
A.100S
B.120S
C.150S
D.180S
第7题
A、1
B、1.5
C、2
D、3
第8题
A.2min
B.5min
C.10min
第9题
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