黄土高原上的黄土究竟是哪来的？“风成说”提出如下证据，请你发挥你的聪明才智并结合

（）是组织、存储、管理、表达和分析处理空间信息的软件工具

A.地理信息系统

B.数据信息系统

C.信息系统

D.卫星定位系统

援引不可抗力条款的法律后果是撤销合同或推迟合同的履行。

To compete in today’s fast-paced competitive environment, organizations are increasingly allowing contractors, partners, visitors and guests to access their internal enterprise networks. These users may connect to the network through wired ports in conference rooms or offices, or via wireless access points. In allowing this open access for third parties, LANs become (171) . Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to (172) activity. For many organizations, however, the operational complexity and costs to ensure safe third party network access have been prohibitive. Fifty-two percent of surveyed CISOs state that they currently use a moat and castle’s security approach, and admit that defenses inside the perimeter are weak. Threats from internal users are also increasingly a cause for security concerns. Employees with malicious intent can launch (173) of service attacks or steal (174) information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with (175) and worms acquired from unprotected public networks. Hackers masquerading as internal users can take advantage of weak internal security to gain access to confidential information.

（174）是（）

A.reserved

B.confidential

C.complete

D.mysterious

公文正本具有哪些特殊形式？

你认为下列哪项工作需要做作业风险分析（）。

A.甲板日常搞卫生

B.进入水泥罐检修

C.接飞机

D.整理库房