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单项选择题
A.0.6m,0.8m,0.8m,1.2m
B.0.6m,1m,1m,1.2m
C.0.4m,0.8m,0.8m,1.2m
D.0.8m,1m,1m,1.2m
单项选择题
A.1m,80m,0.5m
B.1.2m,100m,0.8m
C.1.5m,120m,1m
D.1.8m,120m,1.5m
单项选择题
A.15%
B.20%
C.25%
D.30%
单项选择题
A.不敷设塑料子管
B.应敷设多根塑料子管以节省孔径
C.敷设一根塑料子管
D.可根据情况不敷设塑料子管