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问题 问答题 简答题

变压器在负载运行时，其效率是否为定值？，在什么条件下，变压器的效率最高？

答案

参考答案：变压器负载性质不同，其效率不是一定值。在不变损耗与可变损耗相等时，变压器的效率最高。

单项选择题 B型题

突发突止，刺激迷走神经可以转律的是

A.心房扑动

B.心房颤动

C.阵发性室性心动过速

D.阵发性室上性心动过速

E.窦性心动过速
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单项选择题

Rapid advances in computer and communication technologies have resulted in the (71) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and (72) of information, are leading to the development of (73) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (74) .The (74) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (74) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (75) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user’s point of view there will be a single, uniformly accessible worldwide network.

A．the information
B．distributed systems
C．the applications
D．integrated systems
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