單項選擇題
A.0.5 B.1 C.2 D.3
A.1B.1.2C.1.4D.1.6
A.0.1B.0.2C.0.3D.0.5
A.50 B.100 C.150 D.200
A.1% B.5% C.10% D.20%
A.熱鍍鋅鋼管和鍍鋅管件 B.無縫鋼管和無縫鋼管件 C.焊接鋼管和焊接鋼管件
A.法蘭連接 B.焊接連接 C.螺紋連接
A.7—9 B.9.10 C.9—11 D.10~12
A.1~2扣 B.1—3扣 C.1~4扣 D.2—4扣
A.0.1mB.0.3mC.0.5mD.0.7m
A.5 B.10 C.15 D.20