【单选题】作业:背诵1、会计的概念;2、会计的职能(基本职能,拓展职能);3、什么是核算职能,什么是监督职能,核算职能和监督职能之间的关系;4、会计的目标是什么,会计的信息使用者有哪些。
【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...
【判断题】If a particle has a constant speed, its acceleration equals 0.
【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.