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来源:雅诚德英语网
The advanced vacuum technology was used. Compared with filling Helium, the cost price is sharply decreased.
采用了国内较成熟的真空球罩技术,与充氦气相比,大大降低了成本。
The advanced vacuum technology was used. Compared with filling Helium, the cost price is sharply decreased.
采用了国内较成熟的真空球罩技术,与充氦气相比,大大降低了成本。