设,则=()。
参考答案:π-2
—Can you come back at 3 o'clock tomorrow afternoon?
— . I'll have an important meeting at that time.
A.I hope so.
B.I agree.
C.I'm afraid so.
D.I'm afraid not.
公平交易权包括有权获得质量保障、()等公平交易条件。
A.计量正确
B.价格合理
C.人格尊严
D.分等分级
E.语言文明