单项选择题
A.4/5 B.3/5 C.3/4 D.1/3
A.1.8mm B.2mm C.2.2mm D.2.5mm
A.2mm B.2.5mm C.3mm D.3.5mm
A.0.5A B.0.6A C.0.7A D.0.8A
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