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光纤滑环是什么 ，起到什么作用
 ？

this is the definition of that term, which both live in a dl.

实验室给排水系统设计注意事项

And it gets a definition too, which is this line

This is a 2^nd definition for a single term. A dt may be followed by multiple dds.

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this is the definition of that term, which both live in a dl.

OPPC光缆 光纤复合相线光缆

And it gets a definition too, which is this line

this is a 2^nd definition for a single term.

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恭喜山东客户购买切割粉碎机转子泵一台

dt terms may stand on their own without an accompanying dd, but in that case they share descriptions with the next available dt. You may not have a dd without a parent dt.

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杭州华鑫翻译信息有限公司成立于2006年

this is the definition of that term, which both live in a dl.

小区配电设施切割零售

And it gets a definition too, which is this line

this is a 2^nd definition for a single term.

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dt terms may stand on their own without an accompanying dd, but in that case they share descriptions with the next available dt. You may not have a dd without a parent dt.