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This experiment has not only easy to operate and tangible result, but also pollution of environment.
实验操作简便,效果明显, 且对环境无污染.
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Compare with TIG welding, A - TIG welding had tangible result on elimination of gas holes.
与TIG焊相比, A-TIG焊 在消除气孔方面具有明显的作用.
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