题目内容

原子是由和组成

A. 电子和质子
B. 原子核和核外电子
C. 原子核和质子
D. 核外电子和中子

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弗兰克赫兹实验误差大的原因主要是？

A. 仪器预热不充分，就开始实验
B. 读数是无视差
C. 能量转移量子化变化
D. 仪器本身误差小

B.Further exercise:Choose the best word learned above in this lesson to complete each sentence.My friend is sick at the moment. I might _______ to cook some chicken soup for him.

Some types of foods can taste badly if you don't _______ them in a special way.

I generally like foods that have a salty or sweet _______, but dislike ones that are bitter.