单项选择题
A.0.1～0.5 B.0.2～0.6 C.0.3～0.7 D.0.4～0.8
A.0.2～0.3 B.0.4～0.5 C.0.5～0.7 D.0.6～0.8
A.1° B.2° C.3° D.4°
A.3mm B.5mm C.4mm D.1mm
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