在金信工程中，基本的安全防御系统主要包括（），（），数据安全。
参考答案：物理安全；网络安全
Whenever and wherever we are, keep in mind that we should listen more to others. It’s wrong to express ourselves without thinking. Just as we all know, ___________.
A．a good beginning makes a good ending
B．a still tongue makes a wise head
C．a great hope makes a great man
D．a good husband makes a good wife
紫外线光即（）
A.UV
B.MM
C.μ
D.Mμ之意
