单项选择题
A.1/2 B.1/3 C.1/4 D.1/5
A.左侧 B.下方 C.上方 D.右侧
A.1倍 B.1~1.5倍 C.1.5~1.9倍 D.2~2.5倍
A.0.1mm B.0.2mm C.0.3mm D.0.4mn
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