Maintenance of elevator component knowledge.

维护电梯零部件的技术信息。

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In such fields, an important part of the engineering knowledge is the component knowledge.

零部件知识成为工程知识的一个重要部分。

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In such fields, an important part of the engineering knowledge is the component knowledge.

零部件知识成为工程知识的一个重要部分。

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