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
内容
- 0
如图程序,请补充横线处代码。 A: radius*radius*pi B: radius*radius*math.pi C: radius2*math.pi D: radius2*pi
- 1
An increase in labor productivity shifts the A: labor demand curve rightward. B: labor demand curve leftward. C: labor supply curve rightward. D: labor supply curve leftward
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Which of the following is NOT an element of high-speed rail? A: Speeds up to 199 km/h. B: The need for a wider curve radius. C: Tracks made with continuous welded rails. D: The use of dedicated lines or upgraded existing lines.
- 3
AS曲线，AD曲线（AS curve，AD curve）
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输入一个表示半径的浮点数，计算圆的面积的程序正确的有：（圆周率取3.14，结果保留2位小数） A: radius = float(input())area = 3.14 * radius ** 2print(round(area, 2)) B: radius = float(input())area = 3.14 * radius * radiusprint(round(area, 2)) C: radius = input()print(round(3.14 * radius ** 2, 2)) D: radius = float(input())print(round(3.14 * radius * radius, 2))