This paper introduces the principle of leakage protection unit of mine vacuum feed switch in detail,emphatically analyzes the testing process of higher-level leakage protection of feed loop.是什么意思_This paper introduces the principle of leakage protection unit of mine vacuum feed switch in detail,emphatically analyzes the testing process of higher-level leakage protection of feed loop.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句