若怀疑肝硬化患者合并肝癌,是其甲胎蛋白检查超过了()
A.50μg/L
B.100μg/L
C.200μg/L
D.300μg/L
E.500μg/L
参考答案:E
It seems to some experts that there are only three commonly-used video websites in this area: 56.com,
Youku.com, Tudou.com and they ____ 90% of the market. [ ]
A. make up
B. put up
C. set up
D. take up
函数也可以用作其他函数的(),从而构成组合函数。
A.变量
B.参数
C.公式
D.表达式