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问题 单项选择题 A1型题

不符合软骨瘤的病变特点的是（）

A.多发生于长管状骨和扁骨

B.以内生性软骨瘤为常见

C.Ollier病及Maffucci综合征表现为多发性软骨瘤

D.由软骨细胞及软骨基质组成

E.基质可发生黏液变

答案

参考答案：A

单项选择题

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 （71） to improve their efficiency and reduce （72） . WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care （73） 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 （74）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-（75） deployment and administrative chores.

71（）

A．custom

B．server

C．chains

D．chances
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选择题

一物体受到1N、2N、3N、4N四个力作用而处于平衡，沿3N力的方向作匀速直线运动，现保持1N、3N、4N三个力的方向和大小不变，而将2N的力绕O点旋转60°，此时作用在物体上的合力大小为（　　）

A．2N

B．2

2
 N

C．3N

D．3

2N
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