The experiments were made possible by a novel, one-layer ion trap cooled to minus 269 C (minus 452 F) with a liquid helium bath.
实验利用了一种单层离子势阱，并将其浸在液氦浴中冷却到零下269摄氏度。
Methods Fluoride ion (f) -selective electrode method was used to determine fluorin content of capsicum, tea, corn, rice, toothpaste, tap water and mineral water.
方法对该市不同地点抽取的市售辣椒、茶叶、玉米、大米、牙膏、自来水和矿泉水，采用氟离子选择电极法测定氟含量。
The results are discussed and explained in terms of the electric-f ica tion mechanism through ion-drop interaction during the formation of raindrops in warm clouds.
本文用暖云中雨滴形成时离子与雨滴的相互作用的起电机制来讨论和解释上述结果。
Methods According to "The National Technical Scheme for Endemic Disease Control", the content of fluoride in drinking water was assassed by F-ion selective electrode.
方法按照国家《地方病防治项目技术方案》进行，水氟测定用氟离子选择性电极法。
Method: Fluoride level in drinking water was examined with F-ion selective electrode method.
方法：用氟离子选择电极法检测水氟含量。
Method: Fluoride level in drinking water was examined with F-ion selective electrode method.
方法：用氟离子选择电极法检测水氟含量。
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