单项选择题
A.219mm B.245mm C.248mm D.250mm
A.130mm B.135mm C.100mm D.133mm
A.0.5~1圈,0.5~2圈 B.0.5~2圈,0.5~1圈 C.0.5~1圈,0.5~1圈 D.0.5~2圈,0.5~2圈
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