若抛物线y=x2+mx+n的顶点坐标为(﹣1,4),则m=( ),n=( )
2 , 5
除用磷酸、浓硫酸做催化剂脱水制备环己烯外,还可以用什么方法由环己醇脱水制备环己烯?
Faking a line means to().
A.arrange it on deck in long bights
B.coil it down on deck
C.put a whipping on it
D.stow it below