对空心杯转子异步测速发电机,正确的说法是:当转子转动时,在输出绕组中感应的()。
A. 电动势大小正比于杯形转子的转速,而频率与转速有关
B. 电动势大小正比于杯形转子的转速,而频率与励磁电压频率无关
C. 电动势大小正比于杯形转子的转速,而频率与励磁电压频率相同,与转速无关
D. 电动势大小及频率正比于杯形转子的转速
Those people who questioned the soldiers for a series of controversial reports, are
A. tell
B. say
C. reveal
D. exhibit
I have always liked cafés and ________ in them even now. A caféis an interactive (交互式的) place with a nice atmosphere where people meet.
A. hang up
B. hang over
C. hang on
D. hang out
以下不属于PLC与计算机正确连接方式的是()。
A. 电话线通信连接
B. RS422通信连接
C. RS485通信连接
D. RS232通信连接