在分户计量采暖系统设计，户间传热负荷的处理，下列哪几项是正确的？（）

A、应计入采暖系统的总热负荷，用于室外管网的设计

B、应计入各房间的总热负荷，用于其采暖设备的计算

C、应计入户内系统各管段的总热负荷，用于其管径的设计计算

D、应计算户外系统各管段的总热负荷，用于其管径的设计计算

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 (171) . Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to (172) 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 (173) of service attacks or steal (174) information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with (175) and worms acquired from unprotected public networks. Hackers masquerading as internal users can take advantage of weak internal security to gain access to confidential information.

（174）是（）

A.reserved

B.confidential

C.complete

D.mysterious