牵引电动机的激磁绕组局部短路会造成()。
A.电动机起动速度慢
B.电机车起动速度快
C.对电机车车速无影响
参考答案:B
17.Most hotels in Sanya were full during the Spring Festival, but finally we______find a room in a small guesthouse near the seaside.
A.ought to
B.could
C.might
D.were able to
液压舵机的最大工作压力选得高,则()。
A.转舵速度快
B.可节省舵机功率
C.公称转舵扭矩必定大
D.可减小装置尺寸和重量