【单选题】小王只购买苹果和梨,苹果每斤5元,梨每斤10元。他每周有200元的收入可以花在这两种商品上,当他最大化效用水平时,苹果对梨的边际替代率为()。
【单选题】清初 “四僧”指的是弘仁、髶残、八大山人和( )。
【单选题】Finish the task within three days is next to impossible for such a young man .
B.
within three days 改为 in three days
C.
next to impossible 改为 impossible
D.
such a young man 改为 so a young man
【单选题】Could you tell me __ ? [ ]
【单选题】查看材料
A.
When it is used in rural areas.
B.
When it is environment-friendly.
C.
When it operates at near capacity.
D.
When it operates at regular times.
【单选题】.________是目前国际通行的信息技术产品安全性评估标准?
【简答题】A.When it is breeding. B.When it feels threatened by humans in its territory. C.When its offspring is threatened. D.When it is suffering from illness.