【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 .
【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
【简答题】已知 (1)若a=4,求 (2)若 ,求a的取值范围.
【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 .