【判断题】额定无功功率是指风力发电机组运行在额定功率下及额定电压、频率时的无功功率。
【判断题】电动机的额定功率是指电动机在额定运行时转轴输出的机械功率。
【判断题】额定功率是指电机在额定运行时轴上输出的机械功率 P2,等于从电源吸取的电功率 P1
【单选题】He lived in a small village, ______ was a long way from the railway station.
【单选题】Give me a reason _____ you think that email is a good way for people to communicate.
【单选题】We have just heard a warning on the radio _____________ a typhoon may be on its way.
【单选题】Wh at ’ s the most effective way of treating a patient with depression ? ( )
【单选题】配制 0.556mol · L -1 葡萄糖溶液 1500mL ,需 2.78mol · L -1 和 0.278mol · L -1 葡萄糖溶液各多少毫升?
【单选题】通过热传递,某物体从固态变为液态,下图是该过程物体的温度随时间变化图像,下列说法正确的是 [ ]