Spiratron
旋束管(离心静电聚焦行波管), 径向聚束行波管, 螺旋管
🗣️ 情景例句
Susan, I understand you're in the toy business. Susan
听说 ，是在玩具业工作。
How long did it last?
持续了多久？
You work for the Overseas Engineering Company, don't you?
你在海外工程公司上班，是吗？