They began to think about what use could be _____ such materials. A. made upB. made from C. made ofD. made out
How many times has the college been ? A. added to B. added C. added up D. adding to
(1) 0.5 mol H2SO4 的质量是_________g，含__________个分子，含_______mol氧原子，能和_________mol NaOH完全反应，该硫酸所含氢元素的质量与________mol H3PO4或_______ g HCl
下列算式中，计算结果为x2－3x－28的是（ ）A．（x－2）（x+14）B．（x+2）（x－14）C．（x－4）（x+7）D．（x+4）（x－7）
We are strongly _____ to building a paper-making factory near our city, for it will cause a lot of pollution for us. A. opposed B. disagreed C. banned
下列词语中加点的字，读音完全不相同的一组是( ) A．犄角 绮丽 畸形 风光旖旎 B．枯干 骷髅 鹧鸪 怙恶不悛 C．侥幸 妖娆 翘首 不屈不挠 D．
用导数的定义,求函数y=f(x)=在x=1处的导数.
，
为端点的线段的垂直平分线的方程是 （ ）
B．
C．
D．
