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关注：1
2013-05-23 12:21
求翻译：As you learned earlier, the valve train controls the opening and closing of the cylinder head ports. Although the basic function of these parts is the same, their construction can vary. To be able to work on any type of valve train, you must understand these differences.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
As you learned earlier, the valve train controls the opening and closing of the cylinder head ports. Although the basic function of these parts is the same, their construction can vary. To be able to work on any type of valve train, you must understand these differences.
问题补充： |
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2013-05-23 12:21:38
你刚才了解到，气门控制缸盖端口的开幕式和闭幕式。虽然这些部件的基本功能是相同的，他们的建设可以有所不同。能够任何类型的阀门列车上工作，你必须了解这些差异。
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2013-05-23 12:23:18
如你先前学,列车控制阀的开幕和闭幕的圆柱头端口。 虽然这些部分的基本职能是相同的,其建筑可以更改。 能够工作的任何种类的阀列车,你必须了解这种差异。
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2013-05-23 12:24:58
正在翻译，请等待...
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2013-05-23 12:26:38
前面学过，阀列车控制的开启和关闭的气缸盖端口。虽然这些部件的基本功能是一样的他们的建设可以不同。要能够在任何类型的阀门火车上工作，您必须了解这些差异。
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2013-05-23 12:28:18
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