As it turned out to be a small house party, we ________ so formally.
A. needn't dress up
B. did not have dressed up
C. did not need dress up
D. needn't have dressed up
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对网络的威胁包括_______。 Ⅰ.假冒 Ⅱ.特洛伊木马 Ⅲ旁路控制 Ⅳ.陷门 Ⅴ.授权侵犯 在这些威胁中,属于渗入威胁的是_______。
A. Ⅰ、Ⅲ和Ⅴ
B. Ⅲ和Ⅳ
C. Ⅱ和Ⅳ
D. Ⅰ、Ⅱ、Ⅲ和Ⅳ
利血平的鉴别反应
A. 盐酸普鲁卡因
B. 对乙酰氨基酚
C. 硅胶GF254
D. 黄色希夫碱溶液
E. 对氨基水杨酸钠
局域网交换机具有很多特点。下面关于局域网交换机的论述中说法不正确的是________。
A. 低传输延迟
B. 高传输带宽
C. 可以根据用户级别设置访问权限
D. 允许不同传输速率的网卡共存于同一个网络
The vocabulary and grammatical difference between British and American English are so trivial and few as hardly ________.
A. noticed
B. to be noticed
C. being noticed
D. to notice