4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有可拆内件均需使适当的方法进行检查以确保其通过人孔的可嵌入及可拆。
4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.
所有可拆内件均需使适当的方法进行检查以确保其通过人孔的可嵌入及可拆。
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