非正式群体
参考答案:
改变汽车的质量和速度,都能使汽车的动能发生变化,使汽车的质量变为原来的1/2倍、速度变为原来的2倍时,其动能是原来的________倍
Compared with his sister, Jerry is even more ______ to, and more easily troubled by, emotional and
relationship problems. [ ]
A. sceptical
B. addicted
C. available
D. sensitive