A.撥接頭 B.撥大腰 C.撥小腰 D.交叉撥動
A.4mm B.5mm C.9mm D.1mm
A.不應(yīng)大于2.0‰ B.不應(yīng)小于2.0‰ C.不應(yīng)大于1.0‰ D.不應(yīng)小于1.0‰