来源于伞形科()
A.乳香
B.血竭
C.阿魏
D.安息香
E.苏合香
参考答案:C
(1)用化学用语填空:四氧化三铁______,由5个氮原子组成的1个氮分子______.
(2)下列化学用语书写有误,请在横线上写出正确结果.①镁离子:Mg+2______; ②氧化铝:AlO______.
The matter is just a secret you me. Please don’t tell others about it.
A.from; to
B.between; and
C.from; and
D.between; to