试题与答案

如图所示,光滑绝缘轨道ABP竖直放置,其轨道末端切线水平,在其右侧有一正交的匀强

题型:填空题

题目:

如图所示,光滑绝缘轨道ABP竖直放置,其轨道末端切线水平,在其右侧有一正交的匀强电场、磁场区域,电场竖直向上,磁场垂直纸面向里.一带电小球从轨道上的A点静止滑下,经P点进入场区后,恰好沿水平方向做直线运动.则

(1)小球做沿水平方向做______直线运动(选选填“匀速”,“匀变速”或“变加速”).

(2)小球带______电(选填“正”或“负”);

(3)若小球从B点由静止滑下,进入场区后将立即向______偏(选填“上”或“下”).

答案:

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参考答案:A解析: 各选项,只有土鳖虫既能破血逐瘀,又可续筋接骨,为伤科常用药,尤多用于骨折筋伤,瘀血肿痛。

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题型:单项选择题

"I would almost rather see you dead. " Bobert S. Cassatt, a leading banker of Philadelphia, shouted when his twenty-year-old eldest daughter announced that she wanted to become an artist. In the 19th century, playing at drawing or painting on dishes was all right for a young lady, but serious work in art was not. And when the young lady’ s family racked among the best of Philadelphia’s social families, such an idea could not even be considered.
That was how Mary Cassatt, born 1844, began her struggle as an artist. She did not tremble before her father’s anger, she opposed him with courage and at last made him change his mind. Mary Cassatt gave up her social position and all thoughts of a thousand and a family, which in those times was unthinkable for a young lady. In the end, after long years of hard work and perseverance, she became America’s most important woman artist and the internationally recognized leading woman painter of the time.

What in fact was Mr Cassatt’ s main reason in opposing his daughter’ s wish

A. Drawing and painting was simply unthinkable among ladies in those days.
B. He did not believe his daughter wanted to work seriously in art.
C. He believed an artist’ s life would be too hard for his daughter.
D. Ladies of good families simply did not become artists in those times.

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