Thee outer circle ring rod inner circle without prior processing and has certain precision.

圆棒的外圆和环形件的内圆需经事先加工并具有一定的精度。

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Thee outer circle ring rod inner circle without prior processing and has certain precision.

圆棒的外圆和环形件的内圆需经事先加工并具有一定的精度。

youdao