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关注：1
2013-05-23 12:21
求翻译：球阀是在旋塞阀的基础上发展起来的一种截断阀。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
球阀是在旋塞阀的基础上发展起来的一种截断阀。
问题补充： |
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2013-05-23 12:21:38
The ball valve is developed on the basis of the stopcock a cut-off valve.
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2013-05-23 12:23:18
The ball valve is a stopcock on the basis of a cut-off valve.
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2013-05-23 12:24:58
The ball valve is one kind of block valve which develops in the stopcock foundation.
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2013-05-23 12:26:38
Ball valve plug valve on the basis of the development of a cut-off valve.
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2013-05-23 12:28:18
正在翻译，请等待...
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