题目内容
(请给出正确答案)
[单选题]
矩形风管的边长大于(),或矩形保温风管边长大于800mm,管段长度大于1250mm;或低压风管单边平面面积大于1.2m2,中、高压风管大于1.0m2,均应有加固措施
A.500mm
B.650mm
C.630mm
D.800mm
答案
C、630mm
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A.500mm
B.650mm
C.630mm
D.800mm
C、630mm
A.500
B.1000
C.1100
D.1250
A.玻璃钢风管法兰螺栓孔的间距不得大于120mm
B.玻璃钢风管法兰螺栓孔的间距不得大于150mm
C.矩形玻璃钢风管的边长大于900mm。且管段长度大于1250mm
D.矩形玻璃钢风管的边长大于1000mm。且管段长度大于1250mm
A.500mm
B.1000mm
C.1500mm
D.2000mm
A.1.0,3.0
B.1.2,3.0
C.1.0,20
D.1.2,30