半导体三极管与场效应管的一个重要区别是:三极管为()控制元件,场效应管为()控制元件

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问题:

半导体三极管与场效应管的一个重要区别是:三极管为()控制元件,场效应管为()控制元件。

考点:火电厂热工考试火电厂热工考试题库
题型:填空题

阅读理解。

     Benjamin Bannered was born a few months before another great American-George Washington. Benjamin

was black, but he was not a slave. He and his mother and his grandmother were free.

     Benjamin's grandmother came from England. In America she got a job and worked for many years to pay

for her boat trip across the ocean. After working many more years, she saved enough money to buy a farm.

Benjamin lived with her for a while. She taught him to read and write and do arithmetic.

     Benjamin's neighbors knew that he was clever. They were not surprised when he built a large wooden

clock. He made each piece after studying a small pocket watch. The clock made him famous, for it was one

of the first clocks built in America. People from other places began to send hard problems of all kinds to

Benjamin to settle.

     Thomas Jefferson learned of Benjamin Bannered's ability to settle hard problems. He asked Bannered to help

build the city that was to be the capital of the United States-Washington, D. C.

     Bannered worked hard on the plans for the city. He marked where the streets and buildings-the Capital ( 国

会大厦 ), the White House, and many others-should be built.

     Later, L' Enfant, the Frenchman who designed the new city, had a quarrel, and went back to France in

anger. He took all of the plans with him. The workmen couldn't build without any plans to follow.

     For a while it seemed that the plans for the capital might have to be changed. But Benjamin Bannered

remembered the plans he had helped draw. He drew each again just as he once had built each piece of his

clock.

     If it weren't for Benjamin Bannered, Washington, D. C. might look very different from the way it does

today.

1. Benjamin Bannered is remembered today mainly because _____. [ ]

A. he made the first clock in America

B. he used to be an assistant to L' Enfant, who had designed the city Washington

C. he designed the city Washington when L' Enfant left

D. he was able to build the city Washington as L' Enfant left with his plans

2. When Bannered built a large wooden clock, _____. [ ]

A. people in America showed no surprise

B. his name spread all over America

C. he became the first man in America to build a clock

D. people came from other places to congratulate him

3. Why did Thomas Jefferson ask Bannered to help build the City Washington? [ ]

A. Bannered was famous for building.

B. He was told Bannered was clever.

C. Bannered was hard-working.

D. He believed in Bannered.

4. In building the city Washington, Bannered showed _____.[ ]

A. he had a good memory

B. he was never tired of working

C. he feared no difficulties

D. he was good at drawing

5. What can we know from the passage? [ ]

A. Benjamin Bannered was born on a farm.

B. Benjamin Bannered's mother taught him to write and read.

C. L' Enfant designed and built the City Washington, D. C.

D. Washington, D. C. is exactly the same as it was planned.

题型:填空题

()是根据国家税法规定,在A股和B股成交后对买卖双方投资者按照规定的税率分别征收的税金。

A.佣金

B.过户费

C.印花税

D.营业税

题型:填空题

进入21世纪以来,随着()对能源发展的约束越来越明显,能源可持续发展的压力越来越突出、形势越来越严峻,对能源科技创新的七王爷前所未有的迫切。

A.经济

B.资源

C.环境

D.发展方式

题型:填空题

DE34中和RTCC搭配使用的单元是()

A.AFEA

B.RTGA

C.RMUA

D.WCGA

题型:填空题

舌绛少苔而津润者属

A.瘀血内停
B.阴虚火旺
C.热入营血
D.湿热内阻
E.燥热内结

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