历节病的成因是（）

【名词&注释】

血红素(heme)、网络资源(network resources)、防火墙、合作伙伴(partner)、办公室(office)、系统安全(system security)、拒绝服务攻击(denial of service)、会议室(meeting room)、访问者、的复杂性

[单选题]历节病的成因是（）

A. 重感于邪，兼有肝肾不足
B. 外感风寒湿之气
C. 阳气亏虚，血行不利
D. 肝肾亏虚，筋骨失养
E. 肝肾亏虚，兼感外邪

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学习资料：

[单选题]铁粒幼细胞性贫血主因（）。

A. 线粒体合成血红素功能障碍
B. 胎儿血红蛋白或血红蛋白A2增多
C. 合成血红蛋白的储存铁缺乏
D. 叶酸或和B12缺乏
E. 造血干细胞的数量减少和（或）功能异常

[单选题]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.

A. B

[单选题]患者女，30岁，1周前因外伤至冠折，已作完善根管治疗，检查：冠折断面在龈上、牙齿无松动，无叩痛，咬合关系正常，X线片示1｜恨充完善无根折。

A. D

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