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1 nov 1990 ano - 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。

Descrição:

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。

Adicionado na linha do tempo:

工业大事年表

2 set 2023

1

0

686

Data:

1 nov 1990 ano

Agora

~ 34 years ago

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