—________?
—It's red. [ ]
A. What's this
B. What color is it
C. How are you
答案:B
抗渗混凝土常用的抗渗等级有几个?
张先生在未来10年内每年年底获得1000元,年利率为8%,则这笔年金的终值为14587.56元。( )