肾上腺素与局麻溶液的浓度比应为()
A.1:40000
B.1:80000
C.1:200000
D.1:300000
E.1:400000
参考答案:C
—Do you have enough to _____ all your dai1y expenses?
—Oh,yes,enough to spare. [ ]
A. cover
B. spend
C. fill
D. offer
旅游者在购买商品或者接受服务时,有权获得()等公平交易的条件。
A.质量保障
B.价格合理
C.计量准确
D.承担“三包”