资金成本是投资人对投入资金所要求的最低收益率，也可作为判断投资项目是否可行的取舍标准。 ( )
参考答案：对
Never before _____seen anybody who can play tennis as well as Robert.
A．had she
B．she had
C．has she
D．she has
下列不属于计算机外部存储器的是（）。
A.硬盘
B.光盘
C.C盘
D.内存
