问题
选择题
如图所示，一只闹钟静止放在水平桌面上，下列属于一对平衡力的是：
A．闹钟受到的重力和闹钟对桌面的压力
B．闹钟受到的支持力和闹钟对桌面的压力
C．闹钟受到的重力和桌面对闹钟的支持力
D．桌子受到的重力和闹钟对桌面的压力
答案
答案：C
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如图所示，一只闹钟静止放在水平桌面上，下列属于一对平衡力的是：
A．闹钟受到的重力和闹钟对桌面的压力
B．闹钟受到的支持力和闹钟对桌面的压力
C．闹钟受到的重力和桌面对闹钟的支持力
D．桌子受到的重力和闹钟对桌面的压力
答案：C
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| Hello! My name is Peter. I am from Canada. Now I live in China with my parents. I like China. I like Chinese food, too. I have breakfast at home. I eat an egg, some bread and porridge for breakfast. I don't like milk. I don't have enough (足够的) time to go home for lunch. I usually have lunch at school. The lunch in our school is pretty good. There are many different kinds of food for us. I often eat rice, meat and vegetables. Sometimes I have noodles and dumplings. I always have dinner at home with my parents. We have fish, meat, vegetables, desserts and fruit. | ||||||||||||
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