Each of the first and second switches alternatively performs a turn-on operation and a turn-off operation.
所述第一和第二开关的每一个都交替地进行导通操作和截止操作。
Because the base station power amplifiers have a low efficiency due to the back-off operation, efficiency enhancement techniques become very important.
但由于基站功放工作在一个很深的回退状态，功放效率增强技术就变得非常重要。
The paper summarizes research actuality of on-off operation of small refrigeration system, and explains and analyzes the whole on-off process and its influence.
本文综述了小型制冷系统启停过程的研究现状，详细说明和分析了制冷系统整个启停过程及由此造成的影响。
The paper summarizes research actuality of on-off operation of small refrigeration system, and explains and analyzes the whole on-off process and its influence.
本文综述了小型制冷系统启停过程的研究现状，详细说明和分析了制冷系统整个启停过程及由此造成的影响。
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