treble purchase的中文,翻译,解释,例句
treble purchase
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treble purchase:六轮滑车组
treble ported slide valve 三通闸阀 | treble purchase 六轮滑车组 | treble ram pump 三柱塞泵
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three-fold purchase; treble purchase:三接三滑车
三接三滑车 three-fold purchase; treble purchase | 留眼扎缚 throat seizing | 帆布缀线垫 thrum mat