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
A.10B.20C.40D.60