当两个共点力F1与F2的大小为以下哪组数据时，其合力不可能为5N的是(　　)

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当两个共点力F₁与F₂的大小为以下哪组数据时，其合力不可能为5N的是(　　)

A： $F_{1} = 6 N, F_{2} = 3 N$

B： $F_{1} = 3 N, F_{2} = 3 N$

C： $F_{1} = 5 N, F_{2} = 2 N$

D： $F_{1} = 8 N, F_{2} = 2 N$

上一题下一题 0.0难度选择题更新时间:2019-06-30 11:49:41

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D

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阅读下面材料，从所给的A、B、C、D四个选项中选出最佳的选项。

Dave Green is a 12-year-old boy. He lives in Shanghai with his grandparents, parents and sister Cindy. Dave likes blue best.Look,his jacket and backpack are blue.He is in Class 3.22 boys and 18 girls are in his class.His good friends Liu Kun and Li Jie are in Class 3,too.Miss Wang is their science teacher.She is a good teacher. Her classes are fun. They all like her a lot. Science is not difficult for them! Dave likes playing computer games,but he doesn't play them every day. He studies science every day.

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