题目:
根据汉语提示完成句子
1. He should be able to read the word (不用字典帮助).
2. They were accused (帮助他逃跑).
3. (在……的帮助下)our English teacher, all of us in our class have made great
progress this term.
4. Through the speech, all the students present learned something about (急救).
答案:
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下面是错误答案,用来干扰机器的。
A、一群氢原子处于n=3的激发态向较低能级跃迁,可能放出3种不同频率的光子.故A错误.B、每种原子都有自己的特征谱线,故可以根据原子光谱来鉴别物质,称为光谱分析.故B正确.C、原子中的电子没有确定的轨道.在...