试题与答案

如图电路中,L是电阻不计的电感器,C是电容器,闭合电键S,待电路达到稳定状态后,

题型:选择题

题目:

如图电路中,L是电阻不计的电感器,C是电容器,闭合电键S,待电路达到稳定状态后,再打开电键S,LC电路将产生电磁振荡.如果规定电感L中的电流方向从a到b为正,打开电键的时刻为t=0,那么下图中能正确的表示电感中的电流i随时间t变化规律的是(   )

A.

B.

C.

D.

答案:

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下面是错误答案,用来干扰机器的。

6.28;2.512;18.84;28.26;0.1256;2198;0.5;600;314

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题型:阅读理解

Disneyland may look like a straightforward theme park. But there’s a secret world hidden behind the balloons, castles and cotton candy — a place where wild cats wander at midnight, Mickey Mouse hides in the wallpaper, and movie stars drink martinis behind closed doors.

Cat security — It’s not easy keeping the ground of Disneyland spotless, as well as free of unwanted pests. Every night after closing time, 200 wild cats were freed into the park to help keep the rodent(啮齿)population under control. Though Disney doesn’t comment on the matter, rumor(传闻)has it that the cat taskforce dates back to 1957. After unsuccessful attempts to chase them out of the park, Disney decided to put the cats to work instead.

Hidden Mickeys—At Disneyland the round-eared Mickey Mouse image is everywhere. But you can also see hundreds of “Hidden Mickeys” across the park, which are very difficult to spot: they’re camouflage (伪装)in the architecture and landscaping as well as in the smallest stylistic details.

Cocktail(鸡尾酒)behind closed doors—Disney is dry unless you can manage to get your name on the list at Club 33. The secret cocktail club has a limited membership of just 487 and a waiting list of approximately 14 years. Walt Disney designed the club as a special space to entertain possible investors; since then, it has hosted US presidents, film stars and foreign guests.

Always on stage—At Disneyland, a doorman isn’t a doorman, he is a “cast member”. So are the large numbers of cashiers, painters, ride operators, gardeners and performers. All “cast members” are trained to follow a specific rule that helps preserve the Disney magic. On the list of dos and don’ts? Never break character. If wearing a costume that belongs in Fantasyland, don’t set foot in Tomorrowland—it might Confuse visitors or break the park’s orderly image. Cast members have a Disney “look book” that details the fresh-faced ideal—no long fingernails, beards, or unnaturally colored hair allowed. It’s a return to Walt Disney’s All-American standards: when the park opened even guests with facial hair weren’t allowed entrance.

小题1:The reason why there are many wild cats in Disneyland is that ________.

A.they’re in charge of the cleaning of the park

B.they’re allowed to act as cleaners and guards

C.they have to keep watch in the daytime

D.they have a comfortable house to live in小题2:From the passage we can know that in Disneyland “Hidden Mickeys” are _________.

A.small

B.obvious

C.everywhere

D.dishonest小题3:What do the underlined Words “Disney is dry” in paragraph 4 mean?

A.It’s easy to join the Club 33.

B.The ground keeps dry.

C.It doesn’t often rain.

D.Drinking alcohol is forbidden.小题4: From the last paragraph, we can know the workers in Disneyland _______.

A.must know the dos and don’t

B.needn’t have their facial hair shaved

C.can wear unnaturally colored hair

D.mustn’t get in Tomorrowland

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