攻击者通过端口扫描,可以直接获得()。
A.目标主机的口令
B.给目标主机种植木马
C.目标主机使用了什么操作系统
D.目标主机开放了哪些端口服务
参考答案:C, D
— This is Janine speaking.
— Janine, I want to tell you Pat _____ for London. Have you decided to see him off? [ ]
A. left
B. has left
C. is leaving
D. was leaving
实行定期定额征收方式的个体工商户需要停业的,应当在停业前向税务机关申请办理停业登记,纳税人的停业期不得超过半年。( )