高速运行时,受电弓的平均抬升量限制在()mm范围内,最大允许抬升量为()mm。
参考答案:100-150;200
— Have you seen Tommy, Rose?
— No, I think he ________ America.[ ]
A. has been to
B. has gone to
C. has been in
D. went to
铁路IP网业务由红外轴温系统、信号微机监测系统()视频监控系统。
A.车站
B.电务
C.机务
D.车务