题干

小颐家新买一台蒸汽熨斗,晚饭后,小颐看到妈妈在用蒸汽熨斗熨衣服,房间里有的 灯亮着,有的灯不亮.根据此现象回答以下问题:

(1)家里各用电器的连接方式是串联还是并联?为什么?

(2)蒸汽熨斗内的水沸腾时,小颐发现有“白气”冒出.请你解释“白气”的形成原因是什么?

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答案(点此获取答案解析)

解:(1)家用电器可以单独工作互不影响,所以是并联的关系;

(2)蒸汽熨斗内的水沸腾时,出来的一些高温水蒸气遇到外面较凉的空气会液化成小水滴,就是小颐发现有“白气”;

答:(1)家用电器是并联,因为各用电器可以单独工作互不影响;

(2)水蒸气遇冷液化形成的小水珠;

同类题2

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材料一:今年上半年,在经济增速放缓、出口不畅的形势下,内需对经济增长的贡献率达60%,消费成为拉动经济增长的“稳定器”。下半年我国继续采取多种措施让老百姓“有钱花”,“敢花钱”,推进消费扩大和升级,不断释放消费潜力。为了激发国内经济发展活力,国家还大力实施“大众创业、万众创新”活动,使创新创业成为经济发展新常态。

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同类题4

完形填空

    In the middle of a beautiful day, I was feeling lost, as if the world was crashing on me. didn't know which way to go, except to head out to the countryside. I went to the spot where I used to take my kids-when I still had kids. Now they had  1and were leaving.

I was sitting alone in my car when I saw a man in his seventies, whose problem appeared bigger than mine. He stood near the edge of the road,2a kite spindle(风筝线锭) in his hands. Apparently, lost in thought, he stared skyward. I 3my neck to see how successful he had been in 4 the clouds. Following his string with my eyes, I almost lost5 of the other end. Finally, the kite rested on what seemed to be the highest branch of the 6tree in the park.  Obviously,  that was his grandson's kite!  The kite was a replica (复制品) of a beautiful bald eagle, and its wings spread 70pen. Grandpa had only one 8to his problem: cut the string.

"You wanted it to fly as high as it could. Bill. didn't you?" "Yes, Grandpa,9 wanted to keep it forever. " "There just comes a time when the only thing you can do is to cut the string and let it go. Perhaps by doing that, when it flies very high like real eagles do, it will come back to us. " Grandpa said.

    I 10 how the old man cut the string to let fly the kite. As the two walked away, looked to the 11. There I saw my answer, too. Today I have to cut the final strings that kept my two boys 12my reach. Though I want to keep them forever, I have taught them to fly like an eagle. Maybe by doing this, when it's time to soar like real eagles do. one day they would come back to me.