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bicycle
bicycle
1.
本题要求编程过现一个继承体系，定义一个抽象基类Vehicle，含私有数据成员车速speed，车轮数量wheel。从Vehicle派生出自行车类Bicycle、汽车类Car；从Bicycle和Car中派生出摩托车类Motocycle。
2.
ofo has created a model of bicycle sharing with no piles.
3.
A bicycle is often more（）than a car in towns.
4.
The father helped his children （） the new bicycle they bought online.