您要查找的是不是：
- vacuum tube receiver [电] 真空管接收机
- Diangong Heat tube Vacuum tube heat collector. 电工太阳能热管真空管集热器.
- Diangong Solar vacuum tube heat collector. 电工太阳能真空管集热器.
- Not any air gets into the vacuum tube. 没有空气能进入真空管。
- John Ambrose Fleming invents the vacuum tube. 1904年的今天，约翰·安布鲁斯·弗莱明发明了真空管。
- An electron tube or a vacuum tube. 电子管或真空管。
- Lee de Forest invents the vacuum tube. 李.;德福雷斯特发明电子管。
- A specific vacuum tube which converts light into electrical energy. 把光转换成电能的一种真空管。
- Heat resistance soft vacuum tube avoids damage by hot nozzle. 防热真空软管,免被热吸咀误损。
- Battery used to maintain the grid potential in a vacuum tube. 能够保持潜藏在真空管内的栅格的电池。
- Vacuum tube amplifiers used the first time in coast-to-coast telco circuits. 真空管放大器首次用于大西洋岸至太平洋岸的电信电路中。
- Vacuum tubes require DC voltage sources as well. 真空电子管也要求以直流电压为电源。
- The ancestor of these miniature electronic devices is the vacuum tube. 这些微型电子装置的鼻祖就是真空管。
- Or to reduce cost, add bassoon span of purpose, reduce vacuum tube amount. 或者为了降低成本，有意增大管间距，减少真空管数量。
- All glass vacuum tubes are the key component of solar collectors. 全玻璃真空管是太阳能集热器中的关键部分。
- Cathode-ray tube (CRT): Vacuum tube that produces images when its phosphorescent surface is struck by electron Beams. 阴极射线管:一种真空管,当电子束打在其磷光表面会产生影像。
- Battery for supplying a constant positive voltage to the plate of a vacuum tube. 能够产生真空管金属板稳定负电压的电池。
- The vacuum tube has natural tracing ability against sunlight and it can work when sunlight exists. 真空管对太阳光具有自然跟踪的能力，只要有太阳光辐射，真空管就可工作；
- Laryngeal the person that have phlegmy liquid, usable rubber tube receives a needle to be in charge of pump. 喉头有痰液者，可用橡皮管接针管抽吸。
- In semiconductor receivers transistors take the place of vacuum tubes. 在半导体收音机中晶体管代替了真空管。
