解放初期，一些大城市的广播电台开办了专门的商业电台，取得了不错的效益，在1951年经费已能全部自给的电台是（）。
参考答案：天津台
When the headmaster announced his plan in public at the school's opening ceremony, the ________
of the students present________ against it.[ ]
A. majority; were
B. most; were
C. most; did
D. majority; did
现有A、B、C、D、E五种化合物，它们的水溶液相互反应关系如下：
①A+B→C+H2O ②C+H2SO4→D↓+A ③E+AgNO3→AgC1↓+C
（1）试确定A、B、E的化学式：A______；B______；E______．
（2）写出②的化学方程式：______．
