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【判断题】
稀缺和短缺在经济学中是相同的概念。()A.
正确
B.
错误
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举一反三
【简答题】饭店营销组合策略是 , , , 四大策略的有机组合与搭配。
【简答题】Light: Particle or a Wave? - Many distinguished scientists have attempted to explain how electromagnetic radiation can display what has now been termed duality, or both particle-like and wave-like beh...
【单选题】particle is moving along an arbitrary curved path. Which statement is correct?
A.
The tangential acceleration is not zero.
B.
The normal acceleration is not zero.
C.
Because the velocity only has the tangential component, the normal acceleration must be zero.
D.
If the particle moves with a constant speed, the magnitude of the total acceleration must be zero. [ ]
【单选题】Which one of the following statements is true about axion?
A.
It is known for sure to exist although not enough evidence is available.
B.
It is another possible constituent of dark matter.
C.
The search for hypothetical particle has failed so far.
D.
If successful, experiment will prove it to be the sole form. of dark matter.
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