填制凭证时，正文中不同行的摘要可以相同也可以不同，当然可为空。 ( )
参考答案：错
Most people usually have less money at the end of the month than ____at the beginning.
A．which is
B．which was
C．they have
D．it is
体内法标记红细胞的标记率一般为（）
A.20%～40%
B.40%～60%
C.60%～90%
D.90%～95%
E.95%～98%
