题干

人类正积极开发和利用太阳能,如太阳能热水器、太阳能电池等.江涛想知道家中太阳能热水器吸收太阳能的本领,做了如下探究:天气晴朗时,江涛测得太阳能热水器1 h内使质量为50 kg的水从20℃升高到30℃,问:
上一题 下一题 0.0难度 选择题 更新时间:2019-07-18 10:46:22

答案(点此获取答案解析)

同类题3

阅读文言文,回答问题

      【甲】臣本布衣,躬耕于南阳,苟全性命于乱世,不求闻达于诸侯。先帝不以臣卑鄙,猥自枉屈,三顾臣于草庐之中,咨臣以当世之事,由是感激,遂许先帝以驱驰。后值倾覆,受任于败军之际,奉命于危难之间,尔来二十有一年矣。

       先帝知臣谨慎,故临崩寄臣以大事也。受命以来,夙夜忧叹,恐托付不效,以伤先帝之明,故五月渡泸,深入不毛。今南方已定,兵甲已足,当奖率三军,北定中原,庶竭驽钝,攘除奸凶,兴复汉室,还于旧都。此臣所以报先帝而忠陛下之职分也。至于斟酌损益,进尽忠言,则攸之、袆、允之任也。

(《出师表》)

      【乙】诸葛亮围祁山,南安、天水、安定三郡反应亮。帝遣真①诸军军②郿,遣张邻击亮将马谡,大破之。安定民杨条等略吏民保月支城,真进军围之,条谓其众曰:“大将军自来,吾愿早降耳。”遂自缚出,三郡皆平。真以亮惩于祁山,后出必从陈仓。乃使将军郝昭、王生守陈仓,治其城。明年春,亮果围陈仓,一有备而不能克。增邑,并前二千九百户。四年,朝洛阳,迁③大司马。赐剑履上殿,入朝不趋。真以“蜀连出侵边境,宜遂伐之,数道并入,可大克也”。帝从其计。真当发西讨,帝亲临送。真以八月发长安,从子午道南入。司马宣王溯汉水,当会南郑。诸军或从斜谷道,或从武威入。会大霖雨三十余日,或栈道断绝,诏真还军。真每征行,与将士同劳苦,军赏不足,辄以家财班赐,士卒皆愿为用。真病还洛阳,帝自幸其第省疾。真薨,谥曰元侯。

(《三国志·魏书》)

       【注】①真:指曹真,三国时魏国名将。②军:驻扎。③迁:升迁,升官。

同类题4

通读下面短文,掌握其大意,然后从所给的A、B、C、D四个选项中选出一个可以填入短文空白处的最佳选项。

    “It is the worst day of my life today.” Peter said to himself when he walked home alone. His mind would not stop 1 what happened only just an hour ago on the school soccer field. How could he have missed scoring that goal? His stupid mistake made him 2 His team had lost the game 3 him. He was really worried that his coach might 4the team.

    As soon as he walked through the door, his father asked, “What's wrong, son?” Peter's feelings were written all over his 5 “I lost the game,” Peter replied. “Look, Peter. I don't know what happened. But 6 it was, don't be too hard on yourself. ”

    “I lost the game, Dad. I 7my team. They'll probably never 8 me play again. ” “Soccer is about team effort. You're not the only 9your team lost. If you have a good team, you should support each other. Besides, winning or losing is only half the game. The other half is learning10 to communicate with your teammates and learning from your 11”

    The next day, Peter went to soccer practice with courage rather than fear in his heart. “Hey, guys.” he said to his teammates. “I'm really sorry about yesterday. We were so close to 12that game. But I think 13we continue to pull together, we're going to win the next one.”

    To his surprise and relief, his teammates all nodded 14agreement. “Yeah,” they said, “don't worry about it. It's never just one person's fault. We should think about how we can do 15next time. ”

    Peter smiled. It made him feel lucky to know that he was on a winning team.