短語詞組短語closed -loop servo system 閉環(huán)回路伺服系統(tǒng)semi -closed loop servo system 半閉環(huán)伺服系統(tǒng);半閉環(huán)進(jìn)給伺服系統(tǒng)closed loop servo -control system 閉環(huán)伺服控制系統(tǒng) 返回 closed loop servo system