题干

暑假期间某同学和家人外出旅游,他忘记将家中电视机的电源关闭,电视机处于屏幕保护状态。出门前他家电能表的示数如图所示,10天后他回到家中,电能表的示数为1574.7。这段时间电视机消耗了____ kW·h的电能,电视机处于屏幕保护状态时电功率约为____ W。目前他家已有40W的灯泡5个,正常工作时70W的电视机一台,200W的洗衣机一台,200W的电冰箱一个,800W的电饭锅一个,那么他家里的所有用电器____ (选填“可以”或“不可以”)同时使用。

上一题 下一题 0.0难度 选择题 更新时间:2016-08-08 02:33:31

答案(点此获取答案解析)

2.4kW·h,10W,不可以

同类题2

阅读理解

    Children like to imagine they are someone else in a game. As a parent you might never guess how it can benefit your child. It helps your child:

Develop Social Skills

    As children play pretend games, they explore relationships between family members, friends and coworkers and learn more about how people interact. Playing doctor, they imagine how physicians care for their patients. Imaginative play helps of a game or to lose a pet, they are better able to help those in need. They become more willing to play fair, to share, and to cooperate.

Build Self-confidence

    Children have very little control over their lives. Imagining oneself as a builder of skyscrapers or a super hero defending the planet is inspiring to children. It helps them develop confidence in their abilities and their potential.

Promote Intellectual Growth

    Using imagination is the beginning of abstract thought. Children who can see a king's castle in a mound of sand or a delicious dinner in a mud pie are learning to think symbolically(象征性地). This skill is important in school where a child will have to learn that numbers symbolize groups of objects, letters symbolize sounds, and so on.

Practice Language Skills

    Kids who pretend with their friends do a lot of talking. This helps increase their vocabulary, improve sentence structure and develop communication skills.

Get Rid of Fears

    Pretending can help children get rid of their fears and worries. When children role-play the big, bad monsters under the bed, they gain a sense of control over him and he doesn't seem quite so big or so bad.

同类题5

阅读下文,回答相关问题。

                                                                                                        牵入我家的丝瓜花
        ①邻家院角落里种的丝瓜花,在搭好凉棚后,级级攀登而上,一路牵线而来,爬上高高的院墙,缠上长长的电线,一路牵入我家。细长的触角伸展着,一路向前,有点不牵来就不罢休的架势活像撒野的小孩,吵着嚷着,牵着爬着,伏着吊着就是要牵入我家
        ②丝瓜花,我熟知的老友。在农村的盛夏,它应是最热闹最常见的风景。房前屋后,田头地边,桥头沟边都是它黄花插满头的倩影,它像活泼的村姑,有着素净的笑脸,有着曼妙柔弱的身姿,有着纤纤巧手,或编织,或缠绕,或爬,或吊,或伏、或牵,或在草垛上,在屋檐下,在泡桐树上,在晒衣服的铁丝线上,它都能风情万种地舞蹈,跳出乡村最热烈最热闹最动人的舞蹈。
        ③母亲每年总是在家门前的水沟边上几粒丝瓜籽,两瓢粪水,几根山垴上的狗刺圈着,算是给它安了个窝。过不了些时日,或是一场春雨过后,或是某一个夜晚,它就发芽了,长叶了,抽丝了,牵藤了,开花了,鼓劲似的向上伸展开来,像个撒泼的小子,倔强的丫头,鼓足了劲向上爬。它爬上屋角高高的泡桐树,顺着母亲拉的晾晒衣服的电线,一路向前,向前,丝牵到哪里,花开到哪里,像撒娇的孩童,比赛似的开花,一朵二朵三朵,一朵接一朵,十朵百朵地开。这边开放那边凋零,凋零的花朵下结下一个个嫩绿的小丝瓜,有如初生的粉嫩的婴儿,让人顿生怜惜之意。要不了几天工夫,门前就挂满了长长短短,或弯或直的绿月亮。这是儿时伙伴们最诗意的比喻。那凋落一地的黄丝瓜花,常被我们这些孩童像珍宝一样,一一捡回来造屋儿玩。那黄黄的,柔柔的,卷曲的丝瓜花,多像母亲打的泡蛋汤或炒的蛋籽儿,我们几个伙伴儿围在一个屋角里,造屋儿,学着母亲的样子,做一个能干贤惠的家庭主妇,在几口火砖扛成的瓦片锅上炒蛋籽儿,打泡蛋汤,有小主妇的满足,有天真无邪的乐趣,有望梅止渴的幸福。那时,农村日子是清贫的,吃鸡蛋是件幸福的事儿。母亲总是把丝瓜变着花样做给我们吃,嫩的就做成丝瓜汤,滑嫩可口,特别是喝到见底的那细细的,亮亮的,滑滑的丝瓜籽儿,最是美味。老得刨不动皮的丝瓜,母亲就加几个辣椒连皮清炒,辣和和,也挺下饭。村里的刚子,有一回在我家吃到母亲清炒的老丝瓜,“啧啧”直叹好吃。因为他家人多嘴阔,吃丝瓜,总是加一大锅水煮,一人分一瓢清丝瓜汤。那时,农村的日子虽穷,丝瓜的味却尽在一锅汤里,因为有你一口,就有我一口,大家都有一口,这样的日子虽穷,汤虽清,却能喝出温暖热气来。
        ④爬得最高的丝瓜,往往蓄的时间最久,因为它爬得最高,摘不够,母亲干脆让它蓄老,做丝瓜种。它高高地吊在泡桐树上打秋千,几场秋风秋雨过后,它就没了颜色,空了皮囊。母亲把镰刀绑在杆子上把它割下来,剖开取籽做种,丝瓜瓤用来洗碗或洗澡。母亲每每说,丝瓜真是个宝呀,不但好吃,吃的时间长,养活一家人,这丝瓜瓤还好用,去污强呢。
         ⑤我爱丝瓜花。我爱这以丝瓜花为背景的平凡人生。