吐舌和弄舌一般都属()。
A.中风先兆
B.心气已绝
C.心脾有热
D.热极生风
E.气血两虚
参考答案:C
As the busiest woman in Norton,she made_________ her duty to look after all the other
people's affairs in that town。 [ ]
A. this
B. that
C. one
D. it
旋转电枢式发电机产生的感应电动势为e=εmsinωt伏.如果将电枢的匝数增加1倍,转速增加1倍,其他条件不变,感应电动势为( )
A.e=2εmsin2ωt伏
B.e=2εmsin4ωt伏
C.e=4εmsin2ωt伏
D.e=4εmsin4ωt伏