牵引电动机的补偿绕组的作用是减少片间电阻和改善电位特性以防止环火。
参考答案:错
around the lab, we were taken to see the library.
A.Being shown
B.Showing
C.Having been shown
D.To show
路中心黄色虚线的含义是分隔对向交通流,在保证安全的前提下,可越线超车或转弯。