首页
登录
职称英语
[originaltext] Our sun is exactly an orange, dwarf star. Although it is not
[originaltext] Our sun is exactly an orange, dwarf star. Although it is not
游客
2023-07-17
64
管理
问题
Our sun is exactly an orange, dwarf star. Although it is not nearly the hottest star known, the surface temperature is about 10,000°F, and that of its interior is thought to be in the range of 20,000,000°F. We commonly think of the sun as burning; yet it is too hot to burn and is composed of elemental gases.
The sun is more than 865,000 miles in diameter and has a mass one third of a million times greater than the earth’s.Scientists believe that it is two billion years old and, instead of cooling, is still getting hotter. Perhaps, within next two billion years, it will reach a temperature of sufficient intensity to destroy the earth.
The sun’s halo is almost as hot as its interior. Its tongues of fire leap outward a half-million miles from the sun’s surface at speeds reaching 250,000 miles an hour. Fortunately these tongues do not travel at their full speeds to earth ,nor are their terrific temperatures transmitted through space. Some of the energy from these disturbances does reach our atmosphere ,however, and is believed to changes in weather.
选项
A、About 10,000 °F.
B、About 20,000,000°F.
C、About 2,000,000°F.
D、About 20,000°F.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2844022.html
相关试题推荐
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]Oneofthefirstquestionsanybodyasksaboutanew-bornis“what
[originaltext]Oneofthefirstquestionsanybodyasksaboutanew-bornis“what
[originaltext]M:Afineday,isn’tit?W:Yeah.Howiseverythinggoing,Mike?
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
随机试题
传统中医(traditionalChinesemedicine)可以不借助任何仪器给病人治病,堪称奇迹。“望”、“闻”、“问”、“切”(pulse
特殊解毒剂使用时应注意的是()A.不宜太早使用解毒剂,应先注意观察病情
高纤维膳食以多食茎叶类蔬菜,保证每日膳食纤维摄入量为A.30g B.35g
居民消费价格指数变化幅度的大小,只受居民消费支出结构变动的影响。
若数据的分布比较均匀,应编制()。A.异距数列 B.等距数列 C.单项数列
头痛辨证的关键是 A.辨头痛之部位,分表里B.辨头痛之轾重,分脏腑 C.辨
膀胱最常见的恶性肿瘤是( )。A.鳞状细胞癌 B.腺癌 C.移行细胞癌
封闭式收益分配必须在当年的利润弥补上一年的亏损后才能进行。()
(2016年真题)流动资金贷款申请应具备的条件包括()。A.借款人依法设立
小学儿童的社会性发展突出表现在()。A.社会性认知 B.社会性情感 C.社
最新回复
(
0
)