【简答题】听对话回答问题。 1. What does the girl want to do tomorrow? A. To stay at home. B. To go boating. C. To go for a drive in the countryside. 2. Why does she want to go there? A. Because her mother likes the cou...
【判断题】作用于刚体的力F,其对刚体内任意一点O的矩,因该力的作用点沿其作用线移动而改变。
【判断题】力F对任意点的矩,因F的作用点沿其作用线移动而改变
【简答题】(2011广西崇左,22,10分)(本小题满分10分)矩形、菱形、正方形都是平行四边形,但它们都是有特殊条件的平行四边形,正方形不仅是特殊的矩形,也是特殊的菱形.因此,我们可利用矩形、菱形的性质来研究正方形的有关问题.回答下列问题: (1)将平行四边形、矩形、菱形、正方形填入它们的包含关系的下图中. (2)要证明一个四边形是正方形,可先证明四边形是矩形,再证明这个矩形的_______相等;或者先证...
【简答题】听对话,根据对话内容选择正确的答案。听三遍。 1. What time are they going to leave? A. Two o'clock. B. Three o'clock. 2. What does the woman like best? A. Playing basketball. B. Playing computer s. 3. What will the woma...
【简答题】听下面一段对话,回答第1-2题。 1. What time is it now? A. 9: 30. B. 9: 15. C. 8: 45. 2. Why does Tony want to go to school? A. He loves studying very much. B. He can play with many friends. C. He wants to have a go...
【判断题】力F对于任意一点之矩,不因该力的作用点沿其作用线移动而改变。