A.標(biāo)準(zhǔn)螺紋 B.公制螺紋 C.英制螺紋 D.非標(biāo)準(zhǔn)螺紋
A.5~6° B.6~7° C.8~10° D.12~16°
A.6~8 B.8~10 C.10~12 D.12~14