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- 1X元素原子最外层有2个电子,Y元素原子最外层有7个电子,X和Y形成的化合物为
- 2I_____the subway to get to school every day. I____________the subway to get to school every day
- 3关于x的不等式x2-2kx+k2+k-1>0的解集为{x|x≠a,x∈R},则实数a=_.
- 4This can not only clean the air,but it will also save energy for the building.的翻译.
- 5已知a,b,c是实数,且a=2b+根号2,ab=(根号3)/2*c^2+1/4=0,求bc/a的值
- 6一个关于空气浮力的问题
- 7彩虹到底是红橙黄绿青蓝紫还是红橙黄绿蓝靛紫 (我看彩虹的颜色是红橙黄绿青蓝紫)
- 81/3AA 2/3Aa自由交配,后代中AA Aa aa的比值及计算方法
- 9首字母填空:They usually work on their computers in the e___.They can get a lot of information for
- 10it was cool and cloudy