A.0.015~0.03 B.0.004~0.07 C.0.07~0.075 D.0.03~0.04
A.兩端硬,中間軟 B.兩端軟,中間硬 C.一樣硬 D.一樣軟
A.螺栓 B.螺釘 C.點(diǎn)焊 D.點(diǎn)鉚