A speed control circuit based on phase-locked loop(PLL) is designed to achieve the constant speed operation, and a current-restricting circuit is designed to achieve the constant power operation.是什么意思_A speed control circuit based on phase-locked loop(PLL) is designed to achieve the constant speed operation, and a current-restricting circuit is designed to achieve the constant power operation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句