问题 多项选择题

化苦参碱的结构特点包括()

A.有两个N原子

B.有喹喏里西啶结构

C.有一个叔胺N原子

D.有一个酰胺N原子

E.是苦参碱的Ⅳ一氧化物

答案

参考答案:A, B, C, D, E

解析:本题考查氧化苦参碱的结构与性质。氧化苦参碱是苦参碱的N-氧化物,有喹喏里西啶结构,含有2个氮原子,一个为叔胺氮,呈碱性,一个为酰胺氮,几乎不显碱性。

单项选择题
改错题

此题要求改正所给短文中的错误。对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个钩(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Get a good education is more important today than         小题1: _______________

ever before. In Canada mostly children attend public      小题2: _______________

schools. Public schools are mainly found by governments   小题3: ______________

through tax income. Students in Canada taught in          小题4: _______________

English and in French. The rests of Canadian children        小题5: _______________

attend private schools, that are supported mainly by fees     小题6: _______________

paying by parents. By law ,the children must attend       小题7: _______________

the school from age 5 to 16. There are several different      小题8: _______________

levels in the Canadian education system .The first was      小题9: _______________

called Elementary Schools ,which include kindergartens    小题10: _______________

through grade 7 or 8.