电子商务安全的()指阻挡不希望的信息和网络入侵者
A、保密性
B、完整性
C、认证性
D、防御性
参考答案:D
______ is to be awarded the highest award at this evening’s meeting.
A.Both the director and the writer
B.Both of the director and the writer
C.The director and the writer
D.The director and writer
下面对球隙测量说法不正确的是()。
A.测量时可以不放电
B.测量较费时间
C.结构简单
D.可以测量稳态高电压幅值