A _________________has a wider foot and narrower head.
A: flat bottom rail
B: ullhead rail
A: flat bottom rail
B: ullhead rail
举一反三
- ______is a device attached to a rail to prevent it from creeping in the direction of train travel. A: flat bottom rail B: ullhead rail C: ail ancho D: aseplate
- The cost of the air fare is higher than ______. A: the rail fare B: that of the rail fare C: those of the rail fare D: which of the rail fare
- High speed rail has the advantage over automobile in that______________.
- British Rail has ___________ become more commercial over the past decade.
- Where is the measuring position of the uneven gauge in our country？ A: 10mm below the rail top surface B: 12mm below the rail top surface C: 14mm below the rail top surface D: 16mm below the rail top surface