运用范例教学,在选择范例时必须坚持()、()和()三个基本原则。
参考答案:基本性;基础性;范例性
用所给词的适当形式填空
小题1:His mother made him __________( clean ) all the rooms in two hours.
小题2:A good _______________( begin ) makes half success(成功).
小题3:Do you know the ________(high)of Yao Ming?
小题4:Summer may be the _____________ (good) time to swim in the river .
小题5:She writes_______(careful)enough.
小题6:Could you tell me how ______(get) to the hospital?
小题7:We spent a lot of time _____(do)our homework last night.
单相电容起动异步电动机起动前,起动绕组回路有断线,通电后,则电机()。
A.能正常起动,并能带额定负载正常运行
B.能正常起动,但不能带额定负载,否则过载运行
C.不能自行起动,但外力推动转子后,电机便转动起来,可带额定负载正常运行
D.不能自行起动,但外力推动转子后,电机便转动起来,但不能带额定负载,否则过载运行