三相变极调速电动机常用的接线方法是()和()。
A、YY-Y
B、YY-△
C、△△-Y
D、△△-△
参考答案:A, B
A.速度
B.加速度
C.路程
D.位移
用所给词的适当形式填空。
1. Everyone wants _______ ( achieve) his or her dream.
2. I think Zhang Renjie is much________( realistic) than us.
3. Wang Baoqiang tried his best to perform and he__________( success) in the
end.
4. What are the rules that a teenager should __________( obey) ?
5. Most people come to realize the________(important) of protecting the earth.