题目

如图所示，用两食指同时压铅笔两端，左边手指受到铅笔的压力为F1、压强为p1；右边手指受到铅笔的压力为F2、压强为p2。则F1________F2，p1________ p2（选填“大于”、“等于”或“小于”）。 答案：【答案】等于 小于 【解析】第一空．两手指同时压同一个物体（铅笔两端），铅笔处于平衡状态，铅笔受到两手指的压力是平衡力，两手指对铅笔的压力的大小是相同的，根据物体间力的作用是相互的，两手指受到的压力F1和F2大小就是相等的，即F1=F2；第二空．右边手指的受力面积比较小，根据p=可知 It was an exciting moment for Shen Xue and Zhao Hongbo, a retired married couple from Harbin, China. It was also a great moment for China because it was the country’s first gold medal in the pairs figure(花样) skating competition at the 2010 Vancouver Winter Olympic Games.Everyone was very quiet while Shen and Zhao were skating onto the ice. They were expecting something wonderful to happen. As Soon as the music started, Shen and Zhao skated around the field quickly with beautiful style; every move was perfect. When the music stopped, all the people cheered. In the end Shen and Zhao won the Olympic gold medal.In China, winter sports are not as popular as they are in America and Northern European countries. So China sent only 90 athletes to Vancouver to take part in a few, carefully chosen sports. Such a good decision also led to Wang Meng and Zhou Yang winning gold medals in the little known, but exciting sport of short track (轨道) speed skating.China did not win a lot of medals at these Winter Games. Most of the events are still very new to China and need to be developed. But Chinese athletes learn very quickly. For example, China’s women’s curling team(冰壶队) only began in 2003, but they were No.1 at the 2009 World Women’s Curling Championship.This means that with hard work and a bit of luck, China’s winter stars could soon shine on the world stage.【小题1】Shen Xue and Zhao Hongbo won the gold medal in the _____ event at the 2010 VancouverOlympic.A．pairs figure skatingB．short track speed skatingC．women’s curlingD．long track speed skating【小题2】People were _____ when shen Xue and Zhao Hongbo started skating at the Games.A．noisyB．quietC．cheeringD．excited【小题3】Which of the following is TRUE according to the passage? A．Chinese like winter sports best.B．The short track speed skating isn’t a well known or exciting sport.C．There were 90 Chinese athletes taking part in the Vancouver Games.D．Wang Meng and Zhou Yang lost the game at the Vancouver Games.【小题4】China’s women’s curling team won’t be eight years old until _____.A．2003B．2009 C．2010D．2011【小题5】According to the passage, what made China’s winter athletes get such a success? A．Luck.B．A chance.C．Hard work and a little luck.D．The country’s support.