同步调相机实际是一种无功负载运行的同步电动机.在欠励磁状态下,提供容性负载,()
A.吸收有功功率
B.发出有功功率
C.吸收无功功率
D.发出无功功率
参考答案:C
电解质中挥发性最大的物质是()。
A、NaF
B、AlF3
C、Na3AlF6
D、MgF2
____. What a naughty boy he was! [ ]
A. Down jumped he from the dark
B. From the dark jumped he down
C. He down jumped from the dark
D. Down he jumped from the dark