票据买入方式有（）
A、贴现买入
B、转贴现卖断
C、再贴现
D、卖出回购
参考答案：A
This book is said to be a special one, which __________many events not found in other history books.
A．writes
B．refers
C．deals
D．covers
起泡剂的作用是什么？
