题目

There are two types of people in the world. Although they have equal degree of health and wealth and other comforts of life, one becomes happy and the other becomes unhappy. This arises form the different ways in which they consider things, persons, events and the resulting effects upon their minds. People who are to be happy fix heir attention on the convenience of things: the pleasant parts of conversation, the well prepared dishes, the goodness of the wine and the fine weather. They enjoy all the cheerful things. Those who are to be unhappy think and speak only of the opposite things. There3.炎夏的一天,小明到肯德基餐厅就餐,要了一杯加冰的可乐,看到冰块浮在液面上,杯子外壁出现了一层水珠、小明在用吸管喝可乐前,想到以下问题,请你帮他回答:画出杯子放在桌子上时的受力示意图;杯子外壁上为什么会出现了一层水珠?若碎冰质量约50g,碎冰受到的浮力是多大?(4)为什么能够用吸管喝饮料?
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