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nov 1, 1990 - 1990年11 月1日上海无线电七厂试制出纯度达99.999%的高纯氢气，结束了上海地区不能生产这种高纯气体的历史。

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1990年11 月1日上海无线电七厂试制出纯度达99.999%的高纯氢气，结束了上海地区不能生产这种高纯气体的历史。

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工业大事年表

2 Sep 2023

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731

Date:

nov 1, 1990

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~ 35 years ago

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