债券持有人购买可交换债券后，可以按事先约定的条件和价格将所持债券回售给上市公司股东。（）
参考答案：对
An increasing proportion of our population, unable to live without advanced medical involvement, will become progressively more reliant on expensive technology.
A．interference
B．interruption
C．intervention
D．interaction
按重量计由60%的苯乙烯，40%的甲苯乙烯的单体单元组成的共聚物(初级形状) ( )
A．20
B．24
C．25
D．28
