减压蒸馏系统中设置安全瓶的目的是什么？
参考答案：
平衡内外压力，防止倒吸。
下列排序不正确的是
A．碱性 Mg(OH)2＜NaOH＜KOH
B．微粒半径 Al3+＜F-＜Cl-
C．气态氢化物稳定性 H2O＜NH3＜CH4
D．熔点冰醋酸＜食盐＜金刚石
He was crazy ____ the girl, but it was crazy ____ him to let such a young girl drive his car. [ ]
A. about; of
B. with; of
C. to; of
D.about; for
