问题
选择题
在化学反应里，元素的原子结构发生变化的是 [ ]
A. 质子数
B. 中子数
C. 核电荷数
D. 最外层电子数
答案
答案：D
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在化学反应里，元素的原子结构发生变化的是 [ ]
A. 质子数
B. 中子数
C. 核电荷数
D. 最外层电子数
答案：D
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| It was cloudy that day. A man was sitting in a 1 office. He was telling the doctor about his 2 . "I like football, doctor," he said. "Please help me. My life has 3 been a good one since I became 4 in football and it is getting worse and worse. I can't even 5 well at night. When I close my 6 , I'm out there in the football field 7 after a flying ball. When I wake up, I'm more 8 . What can I do now?" The doctor sat back and said, "You 9 to do your best not to dream about football. Before you are falling asleep, try to 10 about something else. If you do that, I think you will be better." | ||||
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