A.4B.3C.5D.2
A.厚壁無(wú)縫鋼管,無(wú)縫鋼管B.無(wú)縫鋼管,無(wú)縫鋼管C.無(wú)縫鋼管,厚壁無(wú)縫鋼管D.厚壁無(wú)縫鋼管,厚壁無(wú)縫鋼管
A.100mB.1000mC.2000mD.50m