真空泵开始抽取电子枪管里的空气。
The vacuum pumps begin sucking the air from the barrel of gun.
铁锈腐蚀了枪管。
建立了陶瓷镶套枪管设计理论并开发了通用设计程序。
The theory for gun tube design is established, and general program is worked out.
建立了陶瓷镶套枪管设计理论并开发了通用设计程序。
The theory for gun tube design is established, and general program is worked out.
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