单项选择题
A.双臂卡环 B.三臂卡环 C.环形卡环 D.对半卡环 E.联合卡环
A.2mm B.3mm C.4mm D.5mm E.6mm
A.1/4 B.1/3 C.1/2 D.2/3 E.3/4
A.0.5mm B.0.8mm C.1.0mm D.1.3mm E.1.5mm
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