求翻译,If If the internal area is not fully visible,flanges must be provided on the pipe bends.

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求翻译,If If the internal area is not fully visible,flanges must be provided on the pipe bends.

求翻译,If If the internal area is not fully visible,flanges must be provided on the pipe bends.
求翻译,If If the internal area is not fully visible,flanges must be provided on the pipe bends.

求翻译,If If the internal area is not fully visible,flanges must be provided on the pipe bends.
若内部范围难以看清,在肘管弯头处要安装凸缘.(不知道这样翻译是否正确,因为设计专业术语)

若内部区域不能全露,就必须给弯管处装凸缘