问题
填空题
如图所示，在竖直面上放置一个物块，已知物块在斜向下的压力F作用下保持静止．画出物块的受力示意图．并注明各力的名称．
答案
对物体受力分析，受重力G、摩擦力f、墙对物块的支持力N、已知压力F四个力，如图所示：
答：如图所示．
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如图所示，在竖直面上放置一个物块，已知物块在斜向下的压力F作用下保持静止．画出物块的受力示意图．并注明各力的名称．
对物体受力分析，受重力G、摩擦力f、墙对物块的支持力N、已知压力F四个力，如图所示：
答：如图所示．
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| One day a young officer (军官) was at a station. He was 1 his way to visit his mother in 2 town. He wanted to 3 her and tell her 4 his train would arrive. In this way she could meet him at the station in her car. He looked in his 5 but couldn't find the 6 money for the telephone, so he went 7 to ask for help. An old soldier happened to pass by. The officer 8 him and asked, "Have you got any change (零钱) for ten pence (便士)?" "Wait a moment," the soldier answered while he was looking for the money in his pocket. "Don't you know how to speak to an officer?" the officer said 9 . "Now, let's start again. Have you got any change for ten pence?" " 10 , sir," the old man answered quickly. | ||||
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