【简答题】已知正弦交流电压 ,则有效值是 V,角频率是 rad/s,频率为 Hz,初相是 度.
【简答题】已知一正弦电压的幅值为310V。频率为50Hz,初相为 。
【简答题】已知正弦交流电压 ,则它的频率为 Hz,初相角是 。
【简答题】要求写出会计分录 生产甲产品领用A材料800公斤,生产乙产品领用A 材料1000公斤,生产车间一般耗用A材料200公斤,A 材料成本是每公斤41元。
【简答题】已知一正弦电流的解析式为i=8sin(314t-π/3)A,其最大值为 A ,角频率为 rad/s ,周期为 s ,频率为 Hz ,初相为 度 。
【简答题】已知一正弦电流 ,则 该电流的有效值为 A ,频率为 Hz ,初相位为 。
【简答题】,该正弦量的有效值为 A ,角频率为 rad/s ,频率为 Hz ,周期为 s ,初相位为 。
【单选题】What is NOT the significance of the shift of business ownership?
A.
People can have income even they don't go to work.
B.
The employee won't blame the boss for his unfair allocation of profits.
C.
Workers won't complain about 'greedy corporations. '
D.
Retired workers can still receive money if they have contributed retirement plans before.