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

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