题干

在“探究凸透镜成像规律”实验中,蜡烛、凸透镜、光屏在光具座上的位置如图所示,这时烛焰在光屏上成清晰的像(像未在图中画出来),下列说法正确的是(   )

A:光屏上所成的是烛焰倒立、缩小的实像

B:保持凸透镜和蜡烛不动,在光屏向透镜移动过程中,光屏上仍能成烛焰清晰的像且逐渐变大

C:保持凸透镜和光屏不动,将蜡烛移到光具座10cm刻度线处,光屏上成的是烛焰倒立、等大的实像

D:保持凸透镜不动,将蜡烛移到光具座40cm刻度线处,无论怎样移动光屏,都得不到清晰的像

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答案(点此获取答案解析)

D

同类题4

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

The Iron Lady

    Margaret Thatcher, known as the Iron Lady, was one of the toughest political women in the world.

    As the daughter of a businessman and mayor of Grantham, Margaret was educated at a very famous grammar school. ____ Upon graduation, she worked for four years as a research chemist. She then became a lawyer, doing an excellent job in taxation law, in 1954. Miss Margaret stood twice in elections for the Conservative Party before being elected to the House of Commons(下议院) in 1959. ____ After that she quickly became a spokesman for her party, and member of the Shadow Cabinet(影子内阁).

    ____ Thatcher spent quite a lot of time visiting schools and universities, who encouraged people to be creative. After the Conservatives lost power in 1974, she was appointed to the Shadow Cabinet. She was elected leader of the Conservative Party in the following year. In May 1979, she became Britain's first female prime minister, after the Conservatives regained power from Labor.

    ____ She fought against labor organizations. According to a figure reported by her government, traditional industries were reduced to around 15,000 in total and she also made social housing and public transport private.

    She left office on November 28, 1990 after she failed to carry out a fixed rate local tax, which led to huge popular protest from within her party. In 1992, she was appointed to the House of Lords(上议院), as Baroness Thatcher of Kesteven. In the last few years of her life, she has been busy with writing and public speech. This caused her increasingly poor health. ____

A. She got a degree in chemistry at Oxford University.

B. Also she built strong association with US President Reagan.

C. In June 1970, she became secretary of state for education and science.

D. In power, she was best known for her reducing Britain's traditional industries.

E. Therefore, she had to give up many chances of attending public activities.

F. Thatcher was appointed as a Minister in 1961.

G. Thatcher was well-known as a female leader.