一个最简真分数，它的分子和分母的积是24，求这个分数。
或
According to most linguists, beside the difference between speech and writing there is also a difference between ______ and informality.
A．formality
B．familiarity
C．normality
D．formula
下列检查属于血液系统监护的是
A．血尿素氮
B．血肌酐
C．血小板
D．血糖
E．血氨
或
或