题干

在“研究水的沸腾”实验中:

①所用的温度计是利用____的性质制成的.为了完成本次实验,由表格可知,应选用____(水银,酒精)的温度计.

测温物质

凝固点/℃

沸点/℃

水银

﹣39

357

酒精

﹣117

78

②如图甲所示,刚倒入热水时发现温度计管壁模糊,有雾气,很难看清示数,主要原因是水蒸气发生了____(填一种物态变化).

③烧杯上方加一纸盖后进行实验,如图乙所示.每隔1min记录温度计示数(如表),4min时温度计示数如图丙所示,此时温度为____℃,直到水沸腾一段时间后停止读数,由表可知水的沸点为____℃.

时间/min

0

1

2

3

4

5

6

7

8

温度/℃

88

90

92

94

97

98

98

98

④根据如表中的数据在图丁中画出水温随时间变化的图像.____

上一题 下一题 0.0难度 选择题 更新时间:2019-09-18 08:39:36

答案(点此获取答案解析)

液体热胀冷缩,水银,液化,96,98,

同类题2

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    It's generally believed that people act the way they do because of their personalities and attitudes. They recycle their garbage because they care about the environment. They pay $5 for a caramel brulee latte because they like expensive coffee drinks.

    It's undeniable that behavior comes from our inner dispositions(性情), but in many instances we also draw inferences about who we are, as suggested by the social psychologist Daryl Bern, by observing our own behavior. We can be strangers to ourselves. If we knew our own minds, why should we need to guess what our preferences are from our behavior? If our minds were an open book, we would know exactly how much we care about the environment or like lattes. Actually, we often need to look to our behavior to figure out who we are.

    Moreover, we don't just use our behavior to learn about our particular types of character — we infer characters that weren't there before. Our behavior is often shaped by little pressures around us, which we fail to recognize. Maybe we recycle because our wives and neighbors would disapprove if we didn't. Maybe we buy lattes in order to impress the people around us. We should not mistakenly believe that we always behave as a result of some inner disposition.

    Whatever pressures there can be or inferences one can make, people become what they do, though it may not be in compliance(符合) with their true desires. Therefore, we should all bear in mind Kurt Vonnegut's advice: “We are what we pretend to be, so we must be careful about what we pretend to be.”