发电机是将（）转化为电能的机械设备。
A、风能
B、太阳能
C、核能
D、电能以外的其他能源
参考答案：D
输煤系统中带式除铁器和盘式除铁器是如何布置的？
When it is advisable to remain on VHF channel 14 you should say（）.
A.stand by on VHF channel 14
B.come to VHF channel 14
C.VHF channel 14 is the best place for you to stay by
D.remain in channel 14 and do not change
