单项选择题
A.环形卡环 B.回力卡环 C.联合卡环 D.间隙卡环 E.双臂卡环
A.0.5~1.0mm B.1.0~1.5mm C.1.2~2.0mm D.1.5~2.0mm E.0.1~0.2mm
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