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目前,数码管玻壳内真空度的维持等还存在问题,文章最后分析了其原因。
There are still some problems in maintaining the vacuum in package. The reasons are analyzed...
youdao
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目前,数码管玻壳内真空度的维持等还存在问题,文章最后分析了其原因。
There are still some problems in maintaining the vacuum in package. The reasons are analyzed...
youdao