问题
单项选择题
两物体间的作用力与反作用力总是等值、反向、共线，分别作用在这两个物体上。这是（）
A．二力平衡公理
B．加减平衡力系公理
C．力的可传递性原理
D．作用与反作用公理
答案
参考答案：D
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两物体间的作用力与反作用力总是等值、反向、共线，分别作用在这两个物体上。这是（）
A．二力平衡公理
B．加减平衡力系公理
C．力的可传递性原理
D．作用与反作用公理
参考答案：D
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| What do you do at the weekend?Some people like to 1 at home,but others like to go 2 a walk or play football.My friend Jack works hard in a factory during the 3 .At the weekend,he always 4 the same thing.On Saturday he 5 his car and 6 he goes with his family to a village by car. His uncle and aunt have a farm there.It isn't a 7 one but there's always 8 to do on the farm.The children help with the animals and give them their 9 .Jack and his wife help in the field.At the end of the day,they are all 10 and Jack's aunt gives them a big meal.
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