请对8年级英文物理学术词定义比较熟悉的人来解答填空,

题目

请对8年级英文物理学术词定义比较熟悉的人来解答填空,
1.Evidence that describes only what actually happened as exactly as possible is labled:
2.A preliminary explaination that can be tested and compared to scientific evidence is called a(n):
3.A scientific explanition supported by much evidence collected over an extended period of time is called a(n):
4.A ratio used to change one unit of measurement to another is called a(n):

答案

(objective)
(hypothesis)
(theory).
(conversation factor)