【简答题】已知a 2 =1,|a|=-a,求 4-4a 的值.
【简答题】已知 ,求A 2 ,A 4 ,A 100 .
【单选题】The shortcomings of the petrol engine in the nineteenth century include the followings except ______.
A.
unreliable nature of the ignition system
B.
very expensive and not efficient enough
D.
high fire risk caused by petrol
【多选题】根据复旦大学中国保险科技实验室对我国汽车消费者的调查,下列哪些情况是我国消费者非常担心发生的?
C.
自动驾驶汽车在无人乘坐时自己从一个地方行驶到另一个地方
【单选题】根据复旦大学中国保险科技实验室对我国汽车消费者的调查,超过80%的中国消费者对自动驾驶汽车的认知程度是什么样的?
【多选题】根据复旦大学中国保险科技实验室对我国汽车消费者的调查,下列哪些情况是我国消费者非常担心发生的?
B.
自动驾驶汽车在无人乘坐时自己从一个地方行驶到另一个地方
【简答题】The last half of the nineth century ________ the steady improvement in the means of travel. A) has witnessed B) was witnessed C) witnessed D) is witnessed
【单选题】Business cards are likely to have appeared
A.
at the beginning of nineteenth century
B.
at the beginning of twentieth century
C.
before the nineteenth century
【简答题】已知 ,求A 2 ,A 4 ,A 100 .