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卢瑟福提出原子的核式结构模型的依据是用α粒子轰击金箔,实验中发现α粒子()
-- I had a pleasant winter vacation with my family in the north.
-- ______.
I am playing the piano, but now the school bell is _____. ( )
0,﹣(+4),3 12 ,﹣(﹣2),|﹣3|,+(﹣5),并用“<”号连接.