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【单选题】
物体由下向上,在顶面上投影得到的视图,称为( )。A.
俯视图
B.
仰视图
C.
顶视图
D.
主视图
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皮皮学刷刷变学霸
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【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()。
A.
0.5
B.
2
C.
20
D.
40
【单选题】Finish the task within three days is next to impossible for such a young man .
A.
Finish 改为 Finishing
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 __ ? [ ]
A.
when did it happen
B.
when it happened
C.
when was it happen
【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．
【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.
相关题目：
【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()。
A.
0.5
B.
2
C.
20
D.
40