题干

张华同学在探究通过导体的电流与其两端的电压的关系时,记录的实验数据通过整理作出了如图所示的图象,根据图象,下列说法正确的是(   )

A:通过导体甲的电流与其两端的电压成正比

B:导体甲的电阻大于导体乙的电阻

C:当在导体乙的两端加上1V的电压时,通过导体乙的电流为0.2A

D:将a、b两导体串联后接到电压为3V的电源上时,通过导体的电流为0.2A

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答案(点此获取答案解析)

A,D

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    What is the easiest way to stay warm in the super cold?____. At least that is what Santa Claus told me.

    During Christmas, Dennis and I went to Finland. We brought back some tips for keeping warm in a cold temperature.

    ⒈There layers(层)work wonders.

    Start with the base layer, which sits right on your skin: choose something that can absorb sweat____A sweater is a good choice. The most important layer is the outer clothes, which should be waterproof(防水的)and windproof.

    ⒉____.

    You lose heat from every millimeter of uncovered skin, which was the biggest lesson I learned on this trip. My whole body was well covered. But I missed one sport: my face. So it often felt like the wind was going to blow my nose off.

    ⒊Exercise, don't just stand still.

    When it's cold, exercising may be the last thing you feel like doing, but be smart.____and you will feel the difference. When we first got to Finland, we were freezing. But after a couple of minutes jumping around, we felt less cold.

    ⒋If you have a heater

    You may want to turn it all the way up, but it's best to keep it at between 18 and 20 degrees____but not create a huge difference between inside and outside.

A. Grow a crazy beard.

B. The key is what your layer is

C. Cover every bit of your skin

D. That will keep you comfortable

E. Take a walk, faster than your normal speed

F. Don't forget to keep your hands and feet warm, too

G. The middle layer keeps your body heat from getting away