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【单选题】
当总效用增加时,边际效用应该A.
为正值，且不断增加
B.
为负值，且不断减少
C.
为负值，且不断增加
D.
为正值，但不断减少
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反馈参考答案：
举一反三
【单选题】If you are running an upper level fur store, youd better attract your customers by
A.
lowering prices.
B.
mass advertising.
C.
improving the product packaging.
【简答题】When learning a foreign language, one should first pay attention to speaking. It is the groundwork of reading and writing. You'd better try your best to speak. Don't be afraid of mistakes. But ...
【简答题】汽车空调按驱动方式分类可分为 和 。
【单选题】Meeting the______of a strict teacher may be hard but if you have got used to it, you will find how much you are improving.
A.
meaning
B.
standard
C.
ability
D.
document
【简答题】In learning English, one should first pay attention to (注意) listening and speaking. It is the groundwork of reading and writing. You'd better try your best to speak while you do much listening. Don't ...
【简答题】If you are improving your English, make a practical plan.
【单选题】Meeting the _____ of a strict teacher may be hard, but if you have got used to it, you will find how much you are improving.
A.
agreement
B.
standard
C.
ability
D.
experience
【简答题】汽车空调按照驱动方式可以分为 式空调和 式空调。
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