The tracks of high-speed train must have a ________
A: longer curve radius
B: shorter curve radius
C: thinner curve radius
D: wider curve radius
A: longer curve radius
B: shorter curve radius
C: thinner curve radius
D: wider curve radius
举一反三
- One of the 3 elements of high-speed train is ______ A: speed up to 199km/h B: need for a smaller curve radius C: track made with continuous welded rail D: speed up to 500km/h
- At what angle should the roadway on a curve with a 50m radius be banked to allow cars to negotiate the curve at 12 m/s even if the roadway is icy (and the frictional force is zero)?
- a long section of track without joints A: dedicated line B: curve radius C: continuous welded rail
- Which of the following is not an element of high-speed rail? A: The need for a wider curve radius. B: Speed up to 199 km/h. C: Tracks made with continuous welded rails. D: The use of dedicated lines.
- Monopoly maximizes its profit mainly rely on its ___. A: demand curve B: cost curve C: supply curve D: demand curve and cost curve