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问题 问答题 简答题

在电话网络中使用PRC或PRI型电涌保护器时需不需要在其上端加装熔断器？

答案

参考答案：

PRC&PRI型电涌报护器内有后备熔丝，因此无需在其上端加装熔断器或断路器进行报护。

单项选择题

Questions l-5 are based on Passage One:Passage OneLong bus rides are like television shows. They have a beginning,a middle, and an end-with commercials thrown in every three or four minutes. The commercials are unavoidable. They happen whether you want them or not. Every couple of minutes a billboard glides by outside the bus window. “Buy Super Clean Toothpaste”“Drink Good’n Wet Root Beer.”“Fill up with Pacific Gas.”Only if you sleep, which is equal to turning the television set off,are you spared the unending cry of "You Need It! Buy It Now!"The beginning of the ride is comfortable and somewhat exciting, even if you’ve traveled that way before. Usually some things have changed-new houses, new buildings, sometimes even a new road. The bus driver has a style of driving and it’s fun to try to figure it out the first hour or so. If the driver is particularly reckless or daring, the ride can be as thrilling as a suspense story. Will the driver pass the truck in time Will the driver move into the right or the left-hand lane After a while, of course, the excitement dies down. Sleeping for a while helps pass the middle hours of the ride. Food always makes bus rides more interesting.But you’ve got to be careful of what kind of food you eat. Too much salty food can make youvery thirsty between stops.The end of the ride is somewhat like the beginning. You know it will soon be over and there’s a kind of expectation and excitement in that. The seat, of course, has become harder as the hours have passed. By now you’ve sat with your legs crossed, with your hands crossed behind your head. The end comes just at the right time. There are just no more ways to sit.

What is the purpose of this passage ( )

A．To give the writer’s opinion about long bus trips

B．To persuade you to take a long bus trip

C． To explain how bus trips and television shows differ

D．To describe the billboards along the road
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单项选择题 A1型题

6岁小儿，因咳嗽1周后，伴尿量少，水肿，逐渐加重20天入院，无肉眼血尿。入院时血压13.3/9.3kPa（100/70mmHg），全身明显水肿，有腹水。尿蛋白（++），白细胞0～1/HP，红细胞0～2/HP（离心法），血胆固醇360mg/dl，总蛋白4.5mg/dl，白蛋白占35%，尿素氮24mg/dl。经抗感染、利尿、肾上腺皮质激素治疗，2周后肿退，尿蛋白转阴，尿素氮降到16mg/dl。考虑诊断为（）

A.肾炎性肾病

B.单纯性肾病

C.急性肾炎

D.慢性肾炎

E.以上都不是
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