单项选择题
A.1‰ B.3‰ C.5‰ D.7‰
A.0.2mm;0.2mm;0.3mm B.0.3mm;0.3mm;0.4mm C.0.3mm;0.3mm;0.5mm D.0.3mm;0.3mm;0.6mm
A.8~16;0.1~0.2 B.8~16;0.15~0.2 C.9~18;0.15~0.2 D.9~18;0.1~0.2
A.1/4 B.1/2 C.2/3 D.5/6
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