【单选题】In the circuit, N0 is an element. Given that A, ,then is:
【单选题】In a sinusoidal steady-state circuit, N 0 doesn ’ t contain independent sources, Q =15var , =0.8 (lagging) , the real power P is:
【单选题】In the circuit, N 0 has no independent sources, the real power ,λ ( lagging ) , the reactive power Q is:
【单选题】牧区牛羊发病较多,主要表现怀孕动物的流产、死胎,不育,睾丸炎、副睾丸,睾丸肿大组织坏死,波浪热,兽医容易感染,该病可能是
【单选题】牧区牛羊发病较多,主要表现怀孕动物的流产、死胎,不育,睾丸炎、附睾炎,睾丸肿大组织坏死,波浪热,兽医容易感染,该病可能是( )。
【单选题】牧区牛羊发病较多,主要表现怀孕动物流产、死胎,不育,睾丸炎,副睾丸,睾丸肿大,兽医容易感染。该病可能是( )
【单选题】In the circuit, N 0 is an element. G iven that A , V , then N 0 is:
【单选题】A three-phase asynchronous motor is running at rated state, its speed is 970r/min, at this time the frequency of the current in the rotor circuit is __. Choose A,B,C or D.f2=sf1,f1=50Hz,s=(n0-n)/n0.
【多选题】为了降低启动电流,三相鼠笼异步电动机降压启动的方法有( )。
【单选题】牧区牛羊发病较多,主要表现怀孕动物流产、死胎,不育,睾丸炎,附睾、睾丸肿大,兽医容易被感染。该病可能是( )。