shifters

each morning the rock-shifters travel by donkey cart to start work.

每天早晨，岩石搬运工搭着驴车。

Contains symbols for VHF, UHF, and SHF circuit design, including capacitance measurers, nonreciprocal devices, modulators, phase shifters, field polarization devices, and filters.

包含用于甚高频、超高频和特高频路设计的符号，包括容测量、不可逆设备、调制、移相、场极化设备和滤波。