简述城市绿地分类及内容?
参考答案:
城市绿地分类:公园绿地、生产绿地、防护绿地、附属绿地和其它绿地。
I’m calling about the apartment you __the other day. Could you tell me more about it?
A.advertised
B.had advertised
C.are advertising
D.will advertise
(3分)某烃经李比希元素分析实验测得碳的质量分数为85.71%,氢的质量分数为14.29%。该烃的质谱图显示:其相对分子质量为70,该烃的核磁共振氢谱如下图所示,请通过计算确定该烃的实验式、分子式、结构简式。