4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有内件需使用适当的方法进行检查以确保其通过孔的嵌入性及性。
4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有内件需使用适当的方法进行检查以确保其通过孔的嵌入性及性。
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