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铁路营业线施工是指影响营业线设备稳定、使用和行车安全的各种施工作业，按组织方式、影响程度分为（）两类。
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(6) .Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to(7)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 (8) of service attacks or steal (9) information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with (10) and worms acquired from unprotected public networks. Hackers masquer-ading as internal users can take advantage of weak internal security to gain access to confidential information. 空白处（8）应选择（）
土地资源具有的特征包括（）
患者如有疮陷色暗，时流污水，汗出肢冷，嗜卧语低的表现时，中医称之为（）
品饮红茶、绿茶、花茶时，茶水的比例以（）为宜。
生物安全主要指在进行生物学研究和教学过程中采取适当的防护设施、设备、防护原则及技术操作等以减少或消除有潜在危险性的因子暴露及意外释放，从而保证人类和环境的安全；也包括防止病原体或毒素及其相关信息被恐怖主义等不法分子窃取、滥用。
手太阴肺经在何处交于何经（ ）
按《营运车辆技术等级划分和评定要求》（JT/T198—2004）的规定，汽车动力性采用（）作为评价指标。
简述原子吸收测定铁、锌、铜、锰、镁原理及操作步骤。
变形观测的任务是什么？
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