When configuring port security on a Cisco Catalyst switch port， what is the default action taken by the switch if a violation occurs？ （） ["protect （drop packets with unknown source addresses）","restrict （increment SecurityViolation counter）","shut down （access or trunk port）","transition （the access port to a trunking port）"]
侧支性抑制和回返性抑制都属于（） ["突触前抑制","去极化抑制","外周性抑制","突触后抑制"]
PDF格式文件转换为DOC格式文件不正确方法是（）。 ["直接从PDF文件复制文本到DOC文件","利用Adobe Acrobat自身转换功能","直接修改文件后缀名","利用CAJ Viewer的OCR功能"]
血型是人类血液的一种（），（），（）。
The network 172.12.0.0 needs to be divided into subnets where each subnet has the capacity of 458 IP addresses.What would be the correct subnet mask to accomplish this division keeping the number of subnets at the maximum? （） ["255.255.254.0","255.255.254.1","255.255.254.2","255.255.254.3"]
什么是党性？党性原则包含哪些主要内容？
