After a fire broke out in the lab
After a fire broke out in the lab, a lot of equipmAfter a fire broke out in the lab, a lot of equipment ________. A. is damaged B had damaged C. damaged D. was damaged 请详细讲解
答：Do you know what the White House is? Perhaps some of you do while 1(opinion) don...详情>>
问：已知a,b属于R,求证:a^2+b^2>=a*b+a+b-1
答：答案如下： 由（a-1)^2+(b-1)^2>=0 得到a^2+b^2+2>=2(a+b)--------(1) 又由(a+1)^2+(b+1)^2>=2(a+...详情>>
问：“ prefer to...rather than ”是一个词组吗？
答：prefer to do rather than do sth 与其作后者的事情的不如做前者去事情。 可以等同于= prefer to do instead o...详情>>
