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问题 单项选择题

患者男性，62岁，活动时心前区疼痛2年余。1个月来患者发作次数增多，3～5次／天，休息状态下亦能发作，持续15分钟以上缓解。首先考虑的诊断为（）。

A.变异型心绞痛

B.稳定性心绞痛

C.不稳定性心绞痛

D.初发劳力性心绞痛

E.心脏神经症

答案

参考答案：C

解析：患者典型劳力性心绞痛病史2年余，1个月来心绞痛症状发作频繁，休息时亦能发作，时间大于15分钟，符合不稳定性心绞痛的诊断，故首先考虑。

判断题

油气运移到储集层后一定能形成油气藏。
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单项选择题 共用题干题

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.

空白处（8）应选择（）

A.denial

B.virtuous

C.complete

D.traverse
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