A.備母1.5扣 B.備母2扣 C.螺母1.5扣 D.螺母2扣
A.45°~60° B.45°~90° C.60°~90° D.60°~95°
A.不大于1mm,或凹入不小于2mm B.不大于1mm,或凹入不大于2mm C.不大于1mm,或凹入不小于3mm D.不大于1mm,或凹入不大于3mm