单项选择题
A.检测杆 B.动作杆 C.尖端杆 D.表示杆
A.0.2~0.4mm B.0.3~0.5mm C.0.4~0.6mm D.0.5~0.7mm
A.40~44mm B.41~44mm C.42~44mm D.43~44mm