对乙酰氨基酚可采用重氮化偶合反应鉴别,是因其结构中具有()
A.酰胺基
B.酚羟基
C.潜在的芳伯胺基
D.芳伯胺基
E.巯基
参考答案:C
根据句子意思, 用括号中所给单词的适当形式填空。每空一词。
小题1:The policeman is helping the children go _________ the road. (穿过)
小题2:Tomorrow is his _______ birthday, he is excited.(四十)
小题3:Fujian is in the __________ of China. (东南)
小题4:He is a volunteer and often _________ computers for others.(检查)
小题5:I think there's something wrong with my _________. Would you take a look at it? (机器)
小题6:My iPad is _________. I can’t listen to music any more. (break)
小题7:The students are _________ for the exam now in our school. (prepare)
小题8:He is John, an old French friend of __________.(us)
小题9:We’d like to come. We look forward to _________ with you at the party. (chat)
小题10:My _________ flats are very large. They all have big balconies in their flats. (neighbour)
在人际交往过程中,交往主体活动的指向者或接受者,被称之为()
A.群众
B.公关对象
C.公众
D.交往对象