【简答题】已知正弦交流电路中某负载上的电压瞬时值解析式为 u =14.1sin(314 t- π /3)V ,则此电压的最大值为 ______V ;有效值为 ______V ,频率为 ______H Z ,初相位为 _______ 。
【简答题】A.Some industries make great profit with their dominant status. B.Some corruptive officials exploit farmers' profit with superiority. C.Natural resources are located mostly in rural areas. D.Cities ar...
【单选题】Your total scores ()to 89.5.
【简答题】In some developing countries, the result of protecting local industries from competition is ______.