作用偏于下焦，善清相火，退虚热，除下焦湿热
A．黄芩B．黄连C．黄柏D．龙胆草E．苦参
参考答案：C
Bob has a friend who _____ the piano very well. [ ]
A. play
B. playing
C. plays
D. played
信息从源结点传输到目的结点的中途被非法截获，攻击者对其进行修改后发送到目的结点，这属于哪种攻击类型
A．截获
B．窃听
C．篡改
D．伪造
