一Shall we go for a picnic tomorrow?
一If it rain.
A:isn't
B:won't
C:don't
D:doesn't
已知正方体ABCD﹣A1B1C1D1两顶点的坐标为B(﹣1,2,﹣1),D1(3,﹣2,3),则此正方体的外接球的表面积等于____
2CO(g)+O2(g)=2CO2(g)△H=﹣566kJ/mol
Na2O2(s)+CO2(g)=Na2CO3(s)+ 12 O2(g)△H=﹣266kJ/mol
试回答:
_____the lemon sour? Yes, it is.