抛物线y=(x+2)2-3对称轴是( )
已知:
I.醛与醛能发生反应,原理如下:
+CH3CHO 稀碱→ →△−H2O RCH=CHCHO
Ⅱ.烃A在标准状况下的密度为1.25g/L.
请回答:
—Don't answer the door! Mom doesn't let us do it while she is out.