题干

小欣猜想“液体的密度ρ越大,其比热容C也越大.”他查到了一些液体的密度值如表:

物质

密度ρ/(kg/m﹣3

物质

密度ρ/(kg/m﹣3

1.0×103

柴油

0.8×103

煤油

0.8×103

汽油

0.71×103

植物油

0.9×103

酒精

0.8×103

由于不知道表中各种液体之间比热容的大小关系,还需要用实验方法得到实验器材:铁架台(带铁圈)、石棉网、温度计、细线、火柴、烧杯、秒表、天平和砝码(以上每一种器材数量足够、规格相同);火焰相同的酒精灯若干;密度表中所给出的各种液体足量,实验中,小明选取的三种液体分别是煤油、植物油和水.

上一题 下一题 0.0难度 选择题 更新时间:2017-11-07 12:01:41

答案(点此获取答案解析)

同类题2

阅读理解

    Sure, it's good to get along with your teacher because it makes the time you spend in the classroom more pleasant. And yes, it's good to get along with your teacher because, in general, it's smart to learn how to relate to the different types of people you'll meet throughout your life. But really, there's one super-important reason why you should get along with your teacher. Kids who get along with their teachers not only learn more, but they're more comfortable asking question and getting extra help. This makes it easier to understand new materials and do yours best on tests.

    When you have this kind of relationship with a teacher, he or she can be someone to turn to with problems, such as problems with learning or school issues.

    As a kid in elementary or middle school, you're at a wonderful stage in your life. You're like a sponge (海绵), able to suck up lots of new and exciting information. On top of that, you're able to think about all this information in new ways. Your teacher knows that, and in most cases, is thrilled to be the person who's giving you all that material and helping you put it together. Remember, teachers are people, too, and they feel great if you're open to what they're teaching you. That's why they wanted to be teachers in the first place to teach!

    Some kids may be able to learn in any setting, whether they like the teacher or not. But most kids are sensitive to the way they get along with the teacher, and if things aren't going well, they won't learn as well and won't enjoy being in class.