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They require only a visual and physical inspection before use.
只需要在使用前对其进行目视或实际检查即可。
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Visual inspection for the surface quality of equipment and weld seams.
目视检查设备和焊缝的外表面质量。
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Visual inspection for the surface quality of equipment and weld seams.
目视检查设备和焊缝的外表面质量。
youdao