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问题 单项选择题

6～63kV系统可采用中性点不接地系统，以提高供电连续性但单相接地电流大于允许值时，可装设消弧线圈。

同一变电所内如有两台变压器可先设一个消弧线圈，但应( )。

A．两台主变压器中性点接一个消弧线圈；
B．两台主变压器中性点经隔离开关接至一个消弧线圈；
C．两只隔离开关平时只合一只；
D．两只隔离开关平时都打开。

答案

参考答案：B

解析：要求同一变电所内如有两台变压器可先设一个消弧线圈，但应将两台主变压器中性点经隔离开关接至一个消弧线圈；

单项选择题

麻醉中的手术病人发生溶血性反应最早征象（）

A.伤口渗血和低血压

B.腰背酸痛

C.胸闷、呼吸困难

D.寒战、高热

E.面部潮红、出现荨麻疹
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单项选择题

Like many other aspects of the computer age, Yahoo began as an idea, (1) into a hobby and lately has (2) into a full-time passion. The two developers of Yahoo, David Filo and Jerry Yang, Ph. D candidates (3) Electrical Engineering at Stanford University, started their guide in April 1994 as a way to keep (4) of their personal interest on the Internet. Before long they (5) that their homebrewed lists were becoming too long and (6) . Gradually they began to spend more and more time on Yahoo.

During 1994, they (7) yahoo into a customized database designed to (8) the needs of the thousands of users (9) began to use the service through the closely (10) Internet community. They developed customized software to help them (11) locate, identify and edit material (12) on the Internet. The name Yahoo is (13) to stand for "Yet Another Hierarchical Officious Orale", but Filo and Yang insist they selected the (14) because they considered themselves yahoos. Yahoo itself first (15) on Yang’s workstation, "akebono", while the search engine was (16) on Filo’s computer, "Konishiki".

In early 1995 Marc Andersen, co-founder of Netscape Communication in Mountain View, California, invited Filo and Yang to move their files (17) to larger computers (18) at Netscape. As a result Stanford’s computer network returned to (19) , and both parties benefited. Today, Yahoo (20) organized information on tens of thousands of computers linked to the web.

13（）

A.about

B.bound

C.going

D.supposed
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