问题 单项选择题

电力电子设备通常靠精确电源零交叉原理或电压波形的形态进行控制和操作,若电压有谐波成分时,零交叉移动、波形改变,会造成()。

A.失灵

B.失真

C.超差

D.以上都是

答案

参考答案:D

选择题
阅读理解

Ladies and Gentlemen, some strange, wild and wonderful stories colored the news in 2010, you may like them.

● A Copenhagen bus company has put "love seats" on 103 of its buses for people looking for a partner. "Even love at first sight is possible on the bus," said a spokesman for the company to explain the two seats on each bus that are covered in red cloth and a "love seat" sign.

● Shoppers at an international luxury fair in Italy, found a cell-phone-equipped golden coffin(棺材)among the items on display. The phones will help "the dead" contact relatives if they have been buried alive by mistake.

● A man in New York came up with a disarming(手无寸铁的)way to perform his latest bank heist , approaching the clerk’s window with a large bunch of flowers and handing over a note saying “give me the money!”

● An Englishman who lost all his legs and arms in an electrical accident successfully swam across the Channel, a challenge he had been preparing for two years. The whole cost is 400 dollars.

● A set of artificial teeth(假牙) made for Britain's war-time prime minister Winston Churchill known as "the teeth that saved the world" sold for nearly 18,000 pounds (21,500 euros, 24,000 dollars) at auction(拍卖).

● A British woman caused an Internet hate campaign after she was caught on camera dumping(抛弃)a cat in a rubbish bin. She was fined 250 pounds (400 dollars, 280 euros) after pleading guilty.

● The BBC apologized completely and without any doubts after a radio presenter jokingly announced that Queen Elizabeth II had died.

● Two Australian men needed surgery(手术)after shooting each other in the bottoms during a drinking session to see if it would hurt and they were charged 400 dollars separately.

● A Kuwaiti MP(议员) suggested state-aid for male citizens to take second wives, in an effort to reduce the large number of unmarried women in the oil-rich state.

小题1:What is special about the coffin in the second news?

A.It is golden.

B.It has a cell phone.

C.It is new.

D.It has many items.小题2:What is the probable meaning of the underlined word “heist” in the third news?

A.robbery

B.love

C.discussion

D.repair小题3:Who has to spend 400 dollars to do the surgery?

A.A British woman who dumped a cat in a rubbish bin.

B.One who bought Winston Churchill’s artificial teeth.

C.An Australian man who was shot in bottom to test the hurt.

D.An Englishman crossing the Channel without legs and arms.