Do you have a baseball bat?
Yes，____ ____ ．
Does Ann have a baseball?
No, ____ ____ .
Do Jack and Jim have computers?
Yes, ____ ____ ．
Does Chi Yong have a soccer ball?
No，____ ____ ．
Do you have a tennis racket?
No，____ ____ .
在△ABC中，已知a=2bcosC，那么这个三角形一定是（ ）
观察下面频率等高条形图，其中两个分类变量C之间关系最强的是（ ）
