electronic phase angle meter
... electronic pen 电子笔 electronic phase angle meter 电子相位计 electronic photo-voltaic cell 电子光生伏打干电池 ...
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在电子仪器方面，锁相环在频率合成器和相位计等仪器中起了重要作用。
In the electronic instrumentation aspect, the phase-locked loop in instruments and so on in frequency synthesizer and phase meter played the vital role.
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