4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有
拆除内件均需使用适当的方法进行
确保其通过
孔的嵌入
拆除。
修孔；孔（manhole的复数）4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有拆除内件均需使用适当的方法进行确保其通过孔的嵌入拆除。
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