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关注：1
2013-05-23 12:21
求翻译：The main advantages of the system are that only, two winches are required for each pair of derricks and it has a faster cycle time than the slewing derrick system.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
The main advantages of the system are that only, two winches are required for each pair of derricks and it has a faster cycle time than the slewing derrick system.
问题补充： |
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