A.6h B.90min C.84.4min D.60min
A.1~2 B.2.5~4 C.5~10 D.以上均錯
A.羅經(jīng)約經(jīng)3個周期的阻尼擺動才能達到其正常工作溫度 B.羅經(jīng)約經(jīng)3個周期的阻尼擺動才能達到其正常工作電流 C.羅經(jīng)約經(jīng)3個周期的阻尼擺動才能達到穩(wěn)定 D.羅經(jīng)約經(jīng)3個周期的阻尼擺動才能轉(zhuǎn)速穩(wěn)定、誤差消除