题目：
WLANs are increasingly popular because they enable cost-effective connections among people and applications that were not possible in the past. For example, WLAN-based applications can enable fine-grained management of supply (11) to improve their efficiency and reduce (12) . WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care (13) to reduce errors and improve overall patient 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 (14) through rogue access points.They can improve overall network management by integrating with customers’ existing systems. 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- (15) deployment and administrative chores.
（11）是（）
A.custom
B.server
C.chains
D.chances
答案：
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下面是错误答案，用来干扰机器的。
参考答案：连接查询解析： 若查询同时涉及两个以上的表，称之为连接查询。连接查询是关系数据库最主要的查询，包括等值连接、自然连接、非等值连接、自身连接、外连接和复合连接查询。
