火蜂无人机

夏天,太阳是——色的,给人们——； 反射光线成虚像还是实像?折射呢?反射光线成的是实像 还是虚像我明白那个 平面镜成像成虚像 但是 凹面镜汇聚光线为什么会成实像 可以用 光屏来承接吗?折射光线呢 成的都是虚像吗?如果 光反射形成的是实像还是虚像 光源是什么?虚像与实像怎么区分?描述一下怎么通过入射角和法线和平面镜画反射光线? 反射后的光是虚像还是实像投影仪上的镜子,将光反射后能呈现在屏幕上,请问这是实像还是虚像? 比较级得用法In some modern countries we fand a ( ) number of people with university degrees than there are jobs for them to fill.A.large B.far larger C.more large D.more larger如何做答,请详细说明这样做的原因． Why not ( ) the raincoat with you?it's going to rain.A.take B.bring It's going to rain .You'd better -------- the raincoat with you.a,take b,to take c,not taked,not to take ___an umbrella with you,it is going to rain.A.Bring B.Hold c.Take D.Get I think you'd better ( ) the raincoat with you because it'll rain soon.A.to take B.take 折射形成的像是实像还是虚像 比较级 用法poor countries can provide effective competition with imports of cheap goods,because wages are so much lower than( )in america.请问这句话的括号里加these,或什么也不加,哪个正确? 光折射产生的像都是虚像 为什么是错的?. 比较级用法 光的折射形成的虚像于实际的像是等大的吗?我只知道成的虚像比实际的高,那大小呢? 折射一定成虚像吗? 改错Why were you come to our school last Tuesday?___Yesterday you went to the cinema.I hope you have a good time.___ 把Don't bring food to the party. If you do,the teachers will take it away. 变成or和and的形式Don't leave the gym during the party.If you do, the teachers will call your parents.Please bring your ID card.If you don't have y You bring food to the party,the teachers will take it away.（用if连成主从复合句）我忘记了if的条件状语从句的用法,请顺便赐教. If we bring snacks,the teachers will... 啥意思 咋读 谢 急用 If you bring food and drink to school,the teachers will___.A.take it away B.take they away 上班族,想学英语,工作需要回复邮件,和老外对话,自己水平也就三级,呵呵,自己定的希望大家给点意见. 男生说女生是傻瓜是褒义还是贬义?我和他关系挺熟的,平时聊天的时候他老爱说我傻,我想知道他到底是褒义还是贬义? 说这个人内心有个小宇宙.贬义还是褒义? 请给我这些词的比较级和最高级.这些词分别是smart,friendly,funny,kind,shy,pretty,lazy,nice,cold,sloppy,energetic,polite,stubborn,patient,bright,talented,nosiy,boring,generous,stingy,honest如果回答全部正确,我要的是全部 说这个人“世故”是褒义还是贬义? 关于人说话的褒义贬义的成语 英语翻译翻译 Last Friday a storm swept through two villages in the New Territories,destroying （摧毁） fourteen homes.Seven others were so badly damaged （破坏） that their owners had to leave them,and fifteen others had broken windows the last he missed school 中 he missed school是定语从句吗?是the last time he missed school.是的话,那么关系词呢?能省么?省的哪个? 凯蒂·派瑞的《last friday night》歌词翻译 英语翻译对对对,就是就翻译~3Q啦 . 一个女人评价你低调,褒义还是贬义啊