A.N原子的价电子轨道表示式:
B.乙烯分子
的球棍模型:
C.甲烷分子的比例模型:
D.1-溴丙烷的结构简式:C3H7Br
答案:D
John Wednesdays and Fridays. I Mondays and Fridays.[ ]
A. like, likes
B. likes, likes
C. likes, like
现行烤烟国家分级标准将烟叶分为()个等级。