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简述磷酸原供能系统的特点。

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● 下图中的设备是（7）。
（7）

A. ST-ST光纤耦合器
B. SC-SC光纤耦合器
C. ST-SC光纤适配器
D. SC型光纤连接器

（45 ）数据库中数据项 A 和数据项 B 的当前值分别为 1000 和 2000 ， T 1 和 T 2 为两个事务，
调度一和调度二是事务 T 1 和 T 2 的两个调度。
下列说法正确的是
A ）调度一是串行调度，调度二是并发调度，它们等价
B ）调度一和调度二都是并发调度，它们等价
C ）调度二执行后，数据项 A 和 B 的值分别为 950 和 2100
D ）调度一执行后，数据项 A 和 B 的值分别为 950 和 2050

● WLANs are increasingly popular because they enable cost-effective connections among people, applications and data that were not possible, or not cost-effective, in the past. For example, WLAN-based applications can enable fine-grained management of supply and distribution （66） to improve their efficiency and reduce （67）. WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall （68)care. WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing （69）through rogue access points. They help control salary costs, by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network management by integrating with customers’ existing systems, such as OpenView and UniCenter. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time-consuming （70） and administrative chores.

某网络结构如下图所示。除了PC1 外其它 PC 机都能访问服务器 Server1，造成PC1 不能正常访问 Server1 的原因可能是（39）。