A.閃光接觸焊 B.氣壓焊 C.鋁熱焊 D.電流焊
A.5mm B.10mm C.15mm D.20mm
A.轉(zhuǎn)轍角的余切 B.轉(zhuǎn)轍角的正切 C.轍叉角的余切 D.轍叉角的正切