题干

物理学中经常以科学家的名字命名单位,下列哪位科学家的名字被命名为“功率的单位”(    )

A:焦耳

B:安培

C:欧姆

D:瓦特

上一题 下一题 0.0难度 选择题 更新时间:2016-10-08 04:00:49

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D

同类题4

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                                                                                              会哭的人更健康
       ①常言道:“男儿有泪不轻弹。”长期以来,传统观念一直教导我们,哭泣是软弱的表现,尤其对男人更是如此。然而,当我们强忍泪水,听凭痛苦和悲伤侵蚀身体时,其实是拒绝了一种健康的宣泄方式。
       ②哭泣自有其奥妙。美国的生化学家曾做过一个有趣的实验。让一批志愿者先看情感电影,等他们被感动得哭了,就将泪水收进试管。几天后,再利用切洋葱的办法让同一群人流下眼泪。结果显示,因悲伤而流的“情绪眼泪”和被洋葱刺激出的“化学眼泪”成分大不相同,在“情绪眼泪”中含有儿茶酚胺,而“化学眼泪”中却没有。这是大脑在情绪压力下释放出的一种化学物质,体内有过多的儿茶酚胺会引发心脑血管疾病,严重时,甚至还会导致心肌梗死。所以,当我们落下“情绪眼泪”时,排除的是有可能致命的“毒”。
       ③进一步的研究发现,人们心情压抑时,体内还会产生某些对人体有害的生物活性物质。而哭泣时这些有害的生物活性物质也会随着泪液排出体外,这同样也会有效降低有害物质在体内的浓度。
       ④研究还发现,眼泪不仅能把有害物质带出体外,泪腺自身还能分泌出一种活性化合物,这种化合物对全身各部位伤口的修复都能起到积极作用。一个外伤病人,哭得越厉害,伤口便愈合得越快。反之,忍住泪水,压抑了泪腺工作,就会延迟伤口愈合。在这一点上,眼泪不再是意志薄弱的表现,而是加速伤口愈合的天然药物。
       ⑤可见,哭有其生物学意义。哭是对人体的一种安全保护。
       ⑥哭还是人们进行自我心理调节的有效方式之一。在遭遇严重不幸时大哭一场,是人体对不幸的自然反应。人在哭泣后,其情绪强度一般也会降低40%,这便解释了为什么哭后人的心情也会变得稍微舒畅。不情愿哭或哭不出来,身心可能就会出毛病。被抑制的紧张情绪若不能及时发泄出去,还会导致胃和十二指肠溃疡、结肠炎、风湿、冠心病或者其他与情绪有关的疾病发作。像神经性气喘等疾病,就与隐忍不发关系亲密。而偏头疼及许多无名病痛,如胸口发胀、咽喉肿塞、脑袋涨痛等,都可能与过度抑制情绪有关。还有男人大多没有女人长寿,重要缘由之一就是女人一般比男人爱哭。据考证,女性哭的频度为男人的5倍,女性平均每人每月至少要哭5次,而男人只有1次。看来,经常强忍眼泪等于慢性自杀绝非危言耸听。
       ⑦生活中,每个人都可能遇到困难或挫折、委屈郁闷的时候,实在没必要绷着脸强装出一副硬汉样。记住:会哭的人,才更健康。

同类题5

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     Rocky Mountain Summer Adventure Camps Bring Learning to Life!

     The Museum of Idaho Rocky Mountain Adventure Camps are available for students aged 6-14. Participants will have amazing outdoor experiences combined with adventure and fun. Space is limited to 20participants each session and registration is not complete until payment has been received by the Museum of Idaho. Registration fee is non-returnable.

     Junior Adventure Camp

     Children aged 6-9 (must have completed first grade).

     Well conduct experiments, go on field trips, and discover the fun and excitement of science! This year, we will learn about colonial(殖民主义的)science to go along with our exhibit, America’s Revolution!

     Instructor: Chloe Doucette

     Dates: June 27- June30

     Time: 9:00 a.m. - noon

     Cost: $75 per child, $60 per child for MOI members, $50 each additional brother or   sister

     Original Camp

     Children aged 9-12 (must have completed third grade)

     Original Camp is for children who are ready for an exciting full-day outdoor camp. Participants visit various habitats and ecosystems as we explore eastern Idaho. Well go bird watching, hiking in the mountains, and lots more!

Instructors: Alana Jensen, Jerry Petty

     Dates: July 18- July21

     Time: 9:00 a.m.  4:00 p.m.(9:00-6:00 on the last day)

     Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

     High Adventure Camp

     Youth aged 11-14 (must have completed fifth grade)

     High Adventure Camp is for youth who are looking for an amazing summer adventure! This outdoor camp is full of exciting physical challenges and involves participants in even more in-depth activities than the Original Camp. This year, students will study how rattlesnakes experience the outdoors!

     Instructors: Chloe Doucette, Mike Winston, Jerry Petty

     Dates: August 8- August 11

     Time: 9:00 a.m.  4:00 p.m.(9:00  6:00 on the last day)

     Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

     Participate in both Original AND High Adventure for only $200! Call522-1400 ext. 3002 to take advantage of this great offer. If you have any questions about the Museum of Idaho’s education programs, contact Chloe Doucette, Education Director at (208) 522-1400 ext.3002.