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
