【判断题】剩余类环 的子环S={[0],[3],[6],[9],[12]},则S的单位元是[3]
【多选题】从现在到2020年是全面建成小康社会决胜期,要做好以下工作:
【单选题】变压器一次、二次绕组中不能改变的物理量是( )。
【单选题】How to complete a good telephone interview?
A.
Do have small children answer the phone or take massage.
B.
Do eat during a phone interview.
C.
Do answer the phone politely at all times during your job search.
D.
Turn up television or radio.
【简答题】A.By conducting telephone interview. B.By calling at people's houses. C.By asking people questions in the street. D.By asking people to fill in forms in the street.
【多选题】多选(2分)关于卢仝的说法正确的是( )。
【单选题】变压器一次、二次绕组中不能改变的物理量是( )。
【单选题】欲将发电机的三相绕组连成星形时,若误将U2,V2,W1连成一点(中性点),则
A.
三相正弦电压相位互差120度,可以产生对称三相电压
B.
三相正弦电压幅值不尽相同,不能产生对称三相电压
C.
三相正弦电压相位不是互差120度,不能产生对称三相电压