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【简答题】
经过多年的观察和研究人们发现，地球自转轴在空间的位置和指向并不是固定不变的。即地球自转是不均匀的。主要原因是，由于地球是在赤道处突起的不规则的实体，在日、月引力和其他天体引力的作用下，在绕太阳公转过程中地球轴方向就不再保持不变，而产生所谓的（）和（）现象。另外，地球自转轴相对地球本身的位置也不是固定不变的，因而地极点在地球表面上的位置也是随时间变化的，这种现象称为（）。
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皮皮学刷刷变学霸
举一反三
【单选题】Archimedes was a famous Greek mathematician and scientist. He was born around 287 BC and he died in the year 212 BC. Archimedes is most well-known for one specific idea that he came up with. 'Archimed...
A.
Archimedes
B.
Archimedes' Principle
C.
A gold and silver crown
D.
The king of Syracuse
【简答题】陈皮功能疏肝破气、散结消滞。
【单选题】Archimedes was a famous Greek mathematician and scientist. He was born around 287 BC and he died in the year 212 BC. Archimedes is most well-known for one specific idea that he came up with. 'Archimed...
A.
Archimedes
B.
Archimedes's Principle
C.
A Gold and Silver Crown
D.
The King of Syracuse
【单选题】Which of the following statements is true about the driver?
A.
He was not born in London.
B.
He's got a London accent.
C.
He came to London when he was thirteen.
【简答题】陈皮功能 [填空(1)] 、 [填空(2)] 。A. 理气健脾B. 燥湿化痰
【简答题】陈皮功能 ________________ 、 ________________ 。
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