下列哪个部件保存数据具有暂时性______。
A.硬盘 B.软盘 C.RAM D.ROM
参考答案:C
_____ how mirrors produce image, we need to know what light does. [ ]
A. Understanding
B. Understood
C. To understand
D. Having understood
It is______ nice of you to say so.
A.truly
B.true
C.really
D.real