4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有可拆除件均需使用适当的方法进行检查以确保其通过孔的可嵌入性及可拆除性。
4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有可拆除件均需使用适当的方法进行检查以确保其通过孔的可嵌入性及可拆除性。
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