【单选题】What is the text mainly about?
A.
Exact campus crime statistics.
B.
Crimes on or around campuses.
C.
Effective solutions to campus crime.
D.
Concerns about kids'campus safety.
【判断题】在接触器互锁控制三相异步电动机正反转电路中,若改变电动机的转向必须先按下停机按钮,使电动机先停转再反转。()
【判断题】坚持爱国和爱党、爱社会主义相统一,是当代中国爱国主义的本质体现。
【单选题】三相异步电动机转向的改变需要______,可改变其相序从而实现三相异步电动机的正反转控制(或称之为可逆控制)
B.
将三相电源中的A相换B相,B相换C相,C相换A相
【判断题】坚持爱国和爱党、爱社会主义相统一,这是当代中国爱国主义精神最重要的体现。
【判断题】在实际应用中, 一般通过改变三相电源任意两相相序, 来控制电动机的正反转运行。 (2018年)
【简答题】A.It is in the center of the campus. B.It has information about the campus. C.It should have a map of the city. D.It Probably has a campus map.