如果结果不匹配，请 
更多“原型操作（prototype operation)”相关的问题
A.每个对象都可以有一个原型_proto_，这个原型还可以有它自己的原型，以此类推，形成一个原型链。
B.__proto__是原型链查询中实际用到的，它总是指向prototype，换句话说就是指向构造函数的原型对象，它是对象独有的。
C.prototype是原型链查询中实际用到的，它总是指向__proto__，换句话说就是指向构造函数的原型对象，它是对象独有的。
D.对象的prototype指向原型，prototype将对象和原型连接起来组成了原型链
A.创建父类对象作为子类的原型(prototype)
B.使用class关键子继承父类
C.使用extends关键子继承父类
D.创建子类对象作为父类的原型(prototype)
A.“Test实际测试”
B.“Ideate创意构思”
C.“Use实际应用”
D.“Prototype原型实现”
A.JavaScript的类class本质上是基于原型prototype的实现方式做了进一步的封装
B.constructor构造方法是必须的
C.如果类的constructor构造方法有多个，后者会覆盖前者
D.类的静态方法可以通过类名调用，不需要实例化
Walking Robot Carries a Person
The first walking robot capable of carrying a person unveiled on Friday in Tokyo, Japan. Its creators at Waseda University in Tokyo and the Japanese robotics company Tmsuk hope their two-legged creation will one day enable wheel-chair users to climb up and down the stairs and assist the movement of heavy goods over uneven ground.
The battery-powered robot, code-named WL-16, is essentially an aluminium chair mounted on two sets of telescopic poles. The poles are bolted to flat plates which act as feet. WL-16 uses 12 actuators (传动装置) to move forwards, backwards and sideways while carrying an adult weighing up to 60 kilograms (130 pounds). The robot can adjust its body and walk smoothly even if the person it is carrying shifts in the chair. At present it can only step up or down a few millimeters, but the team plans to make it capable of dealing with a normal flight of stairs.
"I believe this bipedal (两足的) robot, which I prefer to call a two-legged walking chair rather than a wheel-chair, will eventually enable people to go up and down the stairs," said Atsuo Takanishi, from Waseda University.
"We have had strong robots for some time but usually they have been manipulators, they have not been geared to carrying people around," says Ron Arkin, at the Georgia Institute of Technology and robotics consultant for Sony. "But I don't know how safe and how user-friendly WL-16 is."
Tmsuk chief executive Yoichi Takamoto argues that bipedal or multi-legged robots will be more useful than so-called "caterpillar (毛毛虫) models" for moving over uneven ground.
WL-16's normal walking step measures 30 centimetres, but it can stretch its legs to 136 cm apart. The prototype (原型) is currently radio-controlled, but the research team plans to equip it with a stick-like controller for the user in future. Takanishi said it will take "at least two years" to develop the WL-16 prototype into a working model.
Smaller, ground-hugging (紧贴地面行走的) robots have been developed to pass across tricky ground. One maggot-like (像蛆一样的) device uses a magnetic fluid to pulse its way along, while another snake-like robot uses smart software to devise new movement strategies if the landscape affects any one part. One ball-shaped robot even uses a leap-and-bounce approach to travel over rough territory. But none of these are big or strong enough to carry a person too.
The robot presented to the public on Friday in Tokyo, Japan
A．surprised visitors from Waseda University.
B．can move up to 60 kilometres per hour.
C．has two legs and is able to carry a person.
D．can transport heavy goods over uneven ground.
