单项选择题
A.40～42mm B.56～58mm C.42～45mm
A.80%t-0.2 B.85%t-0.1 C.90%t-0.2 D.90%t-0.1
A.塑化不好 B.外径小 C.外径大 D.外观质量差
A.烧焦 B.塑化不好 C.偏芯
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