胶体的“布朗运动”和同电荷性及溶剂化作用，是胶体保持稳定的因素。
参考答案：对
—Dad, can I surf the Internet?
—Again? I wish that you ______ going on line ______ your health.
A．know; will do harm to
B．knew; are doing harm to
C．know; have done harm to
D．knew; were doing harm to
管理控制的基本程序是什么？
