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问题 多项选择题

河网地区应调查各河段( )。

A．横断面、纵断面(坡度)水位

B．河流平直及弯曲状况(平直段长度及弯曲段的弯曲半径等)

C．糙率及泥沙含量

D．了解流向、流速、流量的变化特点

E．河段流向、流速、流量关系

答案

参考答案：D,E

单项选择题

车头在车前的一列火车在启动过程中，哪一节车厢的挂钩受力最大？（）

A．第一节车厢

B．最后一节车厢

C．中部的第一节

D．所有车厢挂钩受力相同
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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（7）应选择（）

A.venomous

B.malicious

C.felonious

D.villainous
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