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问题 填空题

已知Ω={（x，y）|x+y＜6，x＞0，y＞0}，A={（x，y）|x＜4，y＞0，x﹣2y＞0}，若向区域Ω上随机投掷一点P，则点P落入区域A的概率为（    ）.

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单项选择题

(66) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (67) , an application-layer protocol, authenticates each peer in an IPsec transaction. IKE negotiates security policy, determining which algorithm may be used to set up the tunnel. It also handles the exchange of session keys used for that one transaction.
Networks that use (68) to secure data traffic can automatically authenticate devices by using (69) , which verify the identities of the two users who are sending information back and forth. IPsec can be ideal way to secure data in large networks that require secure connections among many devices.
Users deploying IPsec can (70) their network infrastructure without affecting the applications on individual computer. The protocol suite is available as a software-only upgrade to the network infrastructure. This alows security to be implemented without costly changes to each computer. Most important, IPsec allows interoperability among different network devices, PCs and other computing systems.

A．IPSec

B．SSL

C．L2TP

D．The Internet Key Exchange
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单项选择题 A1/A2型题

以下营养治疗建议不适用于食管癌患者的是（）。

A.部分梗阻但无反流的患者，可经口提供含完整营养素的全量肠内营养

B.严重畏食时，可经肠外营养提供营养物质

C.食物应含糖类、足够蛋白质和脂肪

D.食管切除术后的患者经口饮食应少量多餐，避免早期饱食感和反流

E.术后较长时间不能恢复正常摄食或经管饲获得足够营养物质时，应提供肠外营养
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