primary tuned amplifier 主调谐放大器
It was not a primary cause but a second-round amplifier, which added seriously to the problem.
投机活动不是一个主要原因，但它是第二轮放大器，加重了问题的严重程度。
It is only when the correct voltages are applied to the A/C amplifier from the key inputs that the primary output (the A/C compressor relay) will be energised.
只有A/C扩大器上的电压是来自输入端的正确电压时，初级输出（即A/C压缩机继电器）才会被激活开启。
The primary function of RF power amplifier is to amplify the RF singal with high efficiency.
射频功率放大器的主要功用是放大射频信号，并且以高效率输出大功率为目的。
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