题干
用所给单词的适当形式填空
①He was one of the best____ in yesterday’s football match.(play)
②More and more____ have come to visit China over these years.(foreign)
③She hoped that her son would become a____.(music)
④The teacher was pleased with her____.(honest)
⑤The mother didn’t know why her daughter was crying____.(noise)
答案(点此获取答案解析）
players,Foreigners,musician,Honesty,noisily
轴上场强E随位置
其中
为大于0的常数，单位为
，
。有一带正电的试探电荷在
处由静止释放。若不考虑其它力的作用。则试探电荷（ ）