电机绕组的重要参数有哪几个？
参考答案：
有极距、节距、电角度、每极每相槽数、极相组与相带。
It's already 10 o'clock. I wonder how it _____ that she was two hours late on such a short trip. [ ]
A. came over
B. came out
C. came about
D. came up
蓄电池容量用充足电的蓄电池放电到规定终了电压（一般为额定电压的90％）时所放出的能量来表示。
