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问题 单项选择题

女性26岁，平素体健，在购物时突然晕厥，来急诊时，神志清楚，血压60/40mmHg，脉搏120次/分，呼吸24次/分，咳嗽时腹痛。最可能是（）

A、脑出血

B、主动脉夹层

C、宫外孕

D、肺栓塞

E、胃肠道出血

答案

参考答案：C

实验题

现有电源、滑动变阻器、电流表、电压表和一个额定电压小于电源电动势的小灯泡，要测量小灯泡的功率随电压变化的情况．

(1)画出所用电路的原理图；

(2)把测得各组P、U值画在P－U2图中，各点组成的图线应大致是什么样子？
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单项选择题

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 efficienty 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 mananement 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 pav for themselves simolv by minimizinu time-consunlina（70）and administrative chores.

A．chores

B．chains

C．changes

D．links
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