单项选择题
A.0.01 B.0.02 C.0.03 D.0.05
A.1.2,0.5 B.1.5,0.5 C.1.2,0.6 D.1.5,0.6
A.2,2 B.3,3 C.4,4 D.5,5
A.1/2B.1/3C.2/3D.1/4
A.1.0 B.1.5 C.2.0 D.2.5
A.31mm B.44mm C.61mm D.80mm
A.31mm B.44mm C.61mm D.69mm
A.26mm B.31mm C.44mm D.61mm
A.热弯:应不小于管道外径的4倍。 B.冷弯:应不小于管道外径的4倍。 C.焊接弯头:应不小于管道外径的1.5倍。 D.冲压弯头:应不小于管道外径。