can you make out the difference between valve and cylinder?

来源: triangle 于 2011-02-25 12:02:14 [] [旧帖] [给我悄悄话] 阅读数 : (38 bytes)
回答: 喔, 明白了, 您那一缸是肛门. 由 我胡说八道 于 2011-02-25 06:13:01

when talking about engine size?

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