在高频头中的射频电平调节电路中使用了双栅极场效应管；
Employing a bigrid EFT, the modulator circuit in the rf head is designed for rf level control.
基于双栅极空气计数管的工作原理，提出了多路输出电源的设计指标。
By the working principle of Double Grid Air Counter (DGAC) employed in detecting exoelectron emission, we put forward the design specifications of the power supply.
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