题干

如图是探究电流通过导体时产生热的多少与哪些因素有关的实验装置.两个透明容器中密封着等量的空气,U形管中液面高度的变化反映密闭空气温度的变化.下列说法正确的是(   )

A:甲实验是为了研究电流产生的热量与电阻的关系

B:甲实验通电一段时间后,左侧容器内空气吸收的热量更多

C:乙实验是为了研究电流产生的热量与电流的关系

D:乙实验通电一段时间后,右侧U形管中液面的高度差比左侧的小

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答案(点此获取答案解析)

B

同类题1

先通读下面的短文,掌握其大意,然后在每小题所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选项。

    I was always 1 and had too many things to do. Whenever my daughter caused me to change my plans, I thought to myself, “We don't have time 2 this.” So the two words I always said to her were: 3.

    The other day, the two of us rode to a 4 near our home. After shopping I bought her an ice cream, and she sat down 5 a table happily admiring the ice cream in her hand. Suddenly a 6 look appeared on her face. “Do I have to eat it up in a hurry, Mum?”

    I nearly cried when hearing this—the pains of a hurried life influenced(影响) my poor girl so deeply! As she looked at me waiting to know if she could 7 her time. I knew I had to make a 8. I thought of the times when I rushed (催促) my child through life, I began 9 what really matters in life….

    “You don't have to 10. Just enjoy it.” I said gently. Her whole face brightened and her shoulders 11. We sat side by side talking about things that interested us.

    When she got to the last bite (一口), she held it out to me, “ I 12 the last bite for you, Mum,” she said 13. As the icy taste put out my thirst, I realized I just got the present of a lifetime. I14 my child a little time… and in return, she gave me her last bite and reminded(提醒) me that things taste sweeter and love is easier to get when you stop rushing 15 life.