【单选题】Long conversation: U4_3_2.mp3: Q1.What's the problem with the man?
A.
He has written three stories and that is not enough.
B.
He has no idea about his new writing assignment.
C.
Writing three stories in two months is too much for him.
D.
The two-month creative writing class is boring.
【单选题】电动机是一种将( )转换成机械能并输出机械转矩的动力设备。
【单选题】实验室里的交流发电机可简化为如图所示的模型,正方形线圈在水平匀强磁场中绕垂直于磁感线的 OO ′ 轴匀速转动。今在发电机的输出端接一个电阻 R 和理想电压表,并让线圈每秒转 25 圈,读出电压表的示数为 10 V 。已知 R = 10 Ω ,线圈电阻忽略不计,下列说法正确的是 ( )
C.
电阻 R 在 5 s 内的平均热功率等于 10 W
【单选题】3U_Lsn_3_C1_Q_2.mp3
A.
The corridors were full of flames and everything was on fire
B.
They heard that the stairwells were gone
C.
They didn’t want to make their way down on foot.
D.
The corner offices were safe as the carpets there were fire proof
【判断题】电动机是一种将电能转换成机械能的动力设备
【单选题】实验室中的交流电压表和交流电流表的读数为交流电的( )。
【简答题】使用美工刀时,应注意自己和他人的安全,不用时,应将刀片退回_________中。