如图所示，标有“6V 3W”字样的小灯泡L和最大电阻为20 Ω的滑_爱下问搜题

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问题多选题

如图所示，标有“6V 3W”字样的小灯泡L和最大电阻为20 Ω的滑动变阻器R串联，接到电压为U的电源上，则下列判断正确的是

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A.若U=6 V，无论怎样移动滑片P，电路的总功率都不会超过3W

B.若U>6 V，且不损坏灯泡和变阻器，无论怎样移动滑片P，电路中的电流一定大于0.5 A

C.若U<6 V，无论怎样移动滑片P，L均不能正常发光

D.当滑片P移至某个位置时，L和R的电功率可以相等

答案

ACD

完形填空

Before our marriage, my wife and I had had dogs separately. Her dog was named Zack, and mine Sam.
After we got married, the dogs lived with us. The first day we brought our daughter home from       after her birth, the dogs       her. They licked(舔) her and rubbed(摩擦)       her, especially Zack. I had to       Zack away from her because it loved her so much that it licked her over and over again. When she      in the cradle（摇篮）, it lay next to her with a paw（爪子）on the side of her cradle. After she grew       , Zack would wait for her on the staircase before she went to bed, then       her to her bed.
     , Sam never did such things.
When my daughter was 5 years old, Zack was poisoned by the kid next door. It was the        day in our lives. At eight o’clock that night, my daughter went to the staircase for      . She looked back at us in fear and       . She had to walk up these stairs alone.
At that time, my dog Sam       and walked to my daughter. It pushed her with its paws and then walked up on the staircase. Then she took its collar and they went upstairs.
In the following six years, Sam      for my daughter on the staircases every night until it died.

判断题

在社会主义建设中，把马克思主义基本原理和中国实际结合起来，排除教条主义和经验主义的干扰，推进中国特色社会主义建设事业。它的哲学依据就是矛盾的特殊性与普遍性的关系原理。( )