And the video was not too good as it focused too much on the portrait QWERTY keyboard.
2
介绍了一种采用只含有会聚场的单透镜的全静电聚焦和偏转系统，这种系统非常适用于制作小型高性能摄象管。
An all-electrostatic focusing and deflecting system characterized by simple lens system is introduced The new system is very useful in producing compact high-performance camera tubes.
Methods: Saliva was collected from 33 healthy and 26 periodontitis individuals respectively, and analysed with isoelectric focusing in polyacrylamide gels.
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