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搜题
【单选题】
There’s no question that self-driving vehicles could be an enormous benefit. The potential for safer cars means accident statistics would drop: some 94% of road accidents in the U. S. involve human error. Older drivers and visually- or physically-impaired people would gain a new level of freedom. How would the elderly and the disabled benefit from driverless cars?A.
They could enjoy greater mobility.
B.
They would have no trouble driving.
C.
They would suffer no road accidents.
D.
They could go anywhere they want.
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】血红蛋白（pI=7．07）、鱼精白（pI=12．20）、清蛋白（pI=4．64）、α1-球蛋白（pI=5．06）及β一球蛋白（pI=5．12），在pH值为4．9的溶液中进行电泳时，向正极泳动的蛋白质是
A.
血红蛋白
B.
全部都是
C.
鱼精蛋白
D.
清蛋白、α1．球蛋白、β一球蛋白
E.
清蛋白
【单选题】单位需求弹性可表示为（ ）。