单项选择题
A.0.3~2 B.0.5~2 C.0.7~2 D.0.9~2
A.0.5~2.5 B.0.6~2.5 C.0.7~2.5 D.0.8~2.5
A.φ100mm B.φ200mm C.φ300mm D.φ400mm