The preparation device has the advantages of simple structure and convenient operation.
本发明的制备装置结构简单，操作方便。
The earth leakage protection device is the necessary device for coal preparation factory.
漏电保护器是选煤厂用电的必要装置。
The earth leakage protection device is the necessary device for coal preparation factory.
漏电保护器是选煤厂用电的必要装置。
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