在研究平抛物体运动的实验中,用一张印有方格的纸记录运动的轨迹,如图,方格的边长L

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问题:

在研究平抛物体运动的实验中,用一张印有方格的纸记录运动的轨迹,如图,方格的边长L=2.5cm,a、b、c、d是轨迹中的四点,求

(1)平抛运动的初速度

(2)平抛运动抛出点的位置(g=10m/s2

考点:实验:研究平抛运动
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引起伤寒不断传播及流行的主要传染源是()

A.潜伏末期病人

B.极期病人

C.恢复期带菌者

D.慢性带菌者

E.恢复期病人

题型:问答题

As late as 1800, women's only place was in the home. The idea of women in the business world was unthinkable. Men were certain that no woman could do a good job outside her home. This was such a widely accepted idea that when the well-known Bronte sisters began writing books in 1864, they had to sign their books with men's names instead.

Teaching was the first profession(职业)open to women soon after 1800. But even that was not an easy profession for women to enter because most schools and colleges were open only to men. Oberlin College in Ohio was the first college in America to accept women.

Hospital nursing became respectable work for women only after Nightingale became famous. Seeing that she was not only a nurse but also a rich and well-educated woman, people began to believe it was possible for women to nurse the sick and still be “ladies”. Miss Nightingale opened England's first training school for nurses in 1860.

The invention of the typewriter(打字机)in 1867 helped to bring women out of the home and into the business world. By 1900. thousands of women were working at real jobs in schools, hospitals, and offices in both England and America. Some women even managed to become doctors or lawyers. The idea that women could work in the business world had been accepted.

63. Why couldn't women become teachers easily? Because_______.

A. the first profession open to them was writing

B. most schools and colleges were open only to men

C. they wanted to be nurses instead  D. they had to work in the business world

64. The article is mainly about_______.

A. women in the business world  B. the famous Bronte sisters

C. schools and colleges in America  D. rights for American women

65. Which fact does the article lead you to believe?

A. The Bronte sisters thought that they were men.

B. England's first training school for nurses was in Ohio.

C. There are more men than women in professional job.

D. Women find it necessary to work harder than before.

66. Which of the following is TRUE.

A. The typewriter was made in the 1970's. 

B. Most Englanders are doctors or lawyers.

C. People's ideas about women's work have changed.

D. The 18th century saw a changing world for women.

题型:问答题

人的心理发展具有连续性与阶段性的特点。

题型:问答题

属于芽接的是()。

A.切接

B.舌接

C.嵌芽接

D.根接

题型:问答题

1886年,()在福建创办的福州船政局,附设有船政学堂,是当时国内最大的造船厂。

A.曾国藩

B.左宗棠

C.李鸿章

D.张之洞

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