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问题 单项选择题

下列哪种放空或者排气管道上不设置阻火器？（）

A、闪点低于或者等于43℃，或者物料最高工作温度高于或者等于物料闪点的储罐的直接放空管

B、可燃气体在线分析设备的放空总管

C、爆炸危险场所内的内燃发动机的排气管道

D、可燃气体储罐的放空管道

答案

参考答案：D

单项选择题

2015年柏林国际消费电子展全球媒体大会4月23日—26日在（）举行。飞利浦、海尔、中兴、根德等消费电子企业和业内专家给与会的300多名记者开“小灶”，介绍它们即将发布的最新产品和最新行业趋势。

A.柏林

B.汉堡

C.法兰克福

D.马耳他
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单项选择题

Like all the huge metropolises of the world, there are lots of diversions both outdoors and indoors in Chicago. The Art Institute of Chicago has one of the world’s (1) art collections, including more French Impressionist paintings than even in the Paris Louvre itself. The Field Museum of Natural History and the Museum of Science and Industry are also great historical and cultural treasure houses to (2) as well as entertain children and adults (3) In the Field Museum one comes (4) a surprisingly big collection of Chinese exhibits from the ancient (5) to the early century. The Sears Tower and the Buckingham Fountain are the pride of the Chicagoans; (6) having 110 storeys is said to be the highest tower in the world and the (7) is the largest fountain in the United States. Lake Michigan is for yachting in summer time, (8) the highlights of Chicago life all the year round are concerts, operas and plays (9) by the city’s orchestra, opera houses and theatres. In summer, especially around the Independence Day, July 4th, many festivals and fairs are given outdoors, which, (10) crowds and crowds of people, with their parades, fireworks, (11) concerts, water-skiing and good foods.

But with all its attractions and beautiful spots Chicago is also a city (12) for crimes. All the dwelling houses are (13) with three doors and visitors have to speak through microphone (14) in the wall to the residents before they can get admitted. In the streets there are white-color telephones. When one finds oneself (15) , he needs only to knock the receiver (16) the hook and the next instant the police will (17) . If one does not drive a car, it may well be dangerous for him or her to go out alone in the evening. At first I did not take this warning seriously. (18) , my two encounters with the Black people (19) dusk in the neighborhood were so unpleasant and frightening that I have (20) shut myself evenings in my room, in almost all studying, imposing a curfew on myself.

16（）

A.off

B.out

C.down

D.away
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