下列电器正常工作时，每秒钟电流做功几十焦的是
| A．教室里的一盏日光灯 | B．微波炉 |
| C．家用手电筒里的灯泡 | D．家用空调 |
某房间的电能表允许通过的最大电流是10A，房中有6个标有“220V 60W”的灯泡，1个标有“220V 1000W”的热水器，一台制冷时耗电为140W的电冰箱和1台耗电80W的电视机，一个标有“220V 1200W”的电饭锅，则（ ）
| A．当电冰箱不制冷时，其它用电器才能同时使用 |
| B．不使用热水器时，其它用电器可以同时使用 |
| C．关闭电视后，其它用电器才可以同时使用 |
| D．所有用电器可以同时使用 |
如图所示是一个电能表，对其中的重要参数，下列说法错误的是
| A．“220V”是说这个电能表应在220伏的电路中使用 |
| B．“10（20）A”是说使用时允许通过的最大电流为10A |
| C．示数“0020.0”是说此时电流正在做功20J |
| D．电能表的计量单位是千瓦时 |
如图所示电路，电源电压为6V且保持不变，L1和L2是额定电压为
6V、电阻为10Ω的相同的灯泡，忽略温度对电阻的影响，下列说法中，正确的是
6V、电阻为10Ω的相同的灯泡，忽略温度对电阻的影响，下列说法中，正确的是| A．当仅闭合S1、S2时，L1和L2都不能正常发光 |
| B．当仅闭合S2、S3时，L1亮、L2不亮 |
C．当仅闭合S1、S3 时，电流表的示数为0.3A |
D．当仅闭 合S2时，电路总电阻为20Ω |
之比I1:I2= ，它们两端的电压之比U1:U2 = 。
的电阻是 Ω，此时通过它的电流是 A。
I will never forget the two impressive things that happened last winter. One of my classmates and I were 36 our project work late at night on my university's campus far from home. Since there was 37 in the forecast, I had worn a winter 38 to school that day with a raincoat in my bag.
Throughout our work on the project, I could 39 that my friend was tired from a very long day working. As we stepped outside to begin the 40 walk home, I 41 she was shivering(颤抖). The temperature had dropped to the low thirties (Fahrenheit) and she 42 had a sweater on. I 43 offered her my warm jacket. She accepted it and asked me what I 44 wear then. I told her I had another one and pretended that my 45 was a jacket. She said later that she 46 the next morning and the first thing on her mind was feeling moved about my 47 of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing 48 I didn’t expect it to be so 49 . A person who I hardly 50 insisted that I wear his jacket. I was 51 touched by this warm gesture. He was so matter-of-fact(讲究实际的) about me 52 his coat, too: he simply took it off and handed it to me telling me that I should 53 it. I used to think that this vast universe was a cold 54 . It turns out that even when the temperature drops low, the people never 55 to warm each other's hearts.
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Throughout our work on the project, I could 39 that my friend was tired from a very long day working. As we stepped outside to begin the 40 walk home, I 41 she was shivering(颤抖). The temperature had dropped to the low thirties (Fahrenheit) and she 42 had a sweater on. I 43 offered her my warm jacket. She accepted it and asked me what I 44 wear then. I told her I had another one and pretended that my 45 was a jacket. She said later that she 46 the next morning and the first thing on her mind was feeling moved about my 47 of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing 48 I didn’t expect it to be so 49 . A person who I hardly 50 insisted that I wear his jacket. I was 51 touched by this warm gesture. He was so matter-of-fact(讲究实际的) about me 52 his coat, too: he simply took it off and handed it to me telling me that I should 53 it. I used to think that this vast universe was a cold 54 . It turns out that even when the temperature drops low, the people never 55 to warm each other's hearts.
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