问题
单项选择题
讨论一个斜面，它有一定的倾斜角度，在哪种情况下小滑块一定不会滑下来？（）
A、小滑块重力沿斜面的分解力大于斜面对它的支撑力
B、小滑块没有重力远小于斜面的重力
C、小滑块重力沿斜面的分解力小于斜面的摩擦力
D、小滑块重力沿斜面的分解力大于斜面的摩擦力
答案
参考答案：C
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讨论一个斜面，它有一定的倾斜角度，在哪种情况下小滑块一定不会滑下来？（）
A、小滑块重力沿斜面的分解力大于斜面对它的支撑力
B、小滑块没有重力远小于斜面的重力
C、小滑块重力沿斜面的分解力小于斜面的摩擦力
D、小滑块重力沿斜面的分解力大于斜面的摩擦力
参考答案：C
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| On a cold November afternoon, my mother and l were walking home from a pizza store. We were dressed 1 and equipped with the rented video we had been dying for. I was feeling a little 2 ,as I was carrying our shopping bags of snacks and the 3 . They were so heavy that I decided to 4 some things.So I started to walk towards the garbage can when I noticed a poor man walking his 5 out of the restaurant in front of us. He 6 a paper bag with his dirty hand. He headed over to another nearby garbage can and started 7 it. I suddenly felt very 8 because I was about to do away with a new drink just 9 it was heavy. I knew this man would take all he could 10 ,so I walked up to him and 11 the drink and some snacks to him. The man looked up 12 and took what I gave him. A huge smile spread 13 his face and this caused me to feel indescribable 14 .1 felt like I 15 be happier with myself. But then he said , " This is my son's lucky day ! " With that, he 16 me happily and started off on his bike. I even heard him 17 a song as he rode away. I got a warm feeling inside and I knew I had done something good, for the man and his family. I now understand what is 18 by the saying"Giving is getting" . Since then,every time I have the 19 to do something nice,the image of the man's happiness caused by my small gifts appears in my mind. This is the 20 of charity. | ||||
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