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为什么在LED灯泡工作时,随着温度的升高 ,色温会越来越高,显色指数越来越高,照度反而会越来越低? 降低温度,用蓝色的滤色片么?蓝色不是色温高么? LED 温度升高 色温如何变?温度升高,禁带不是变窄吗?那光子能量小,波长长,不是发出更偏红的光吗?那CCT就减小了?CCT 应该增大 但原理上我说不通。 arrive和reach的差别?这两个不是相同意思吗?差别在哪里?请简单说明.还有如果用英文说(请抵达了之后,联系我)请问(抵达后)应该要用过去式吗?还有顺便告诉我什么是及物动词,不及物动词 arrive和reach有什么区别这道题: Who was the first one ( )? A.to reach B.to arrive C.to get to D.to arrive at She does her homework every day 改否定句 为什么 具体点 Li ming doesn`t know how to sell the words的中文意思 同意句转换 she doesn't know where she can go.=she doesn't know — — —.(三个空) Let’s ___ (have) ice cream .让我们也有冰淇淋 空格是填have吗 可以的话告诉我为什么 Would you have an ice-cream? have ice cream for( ?)括号里有三个答案1dessert 2meal 3drink 选哪一个?并说明理由 色温和显色指数有什么区别 、什么是照明灯具的发光效率、色温、显色指数? She does not does her homework这句话是对是错 色温与显色指数有没有直接或间接地关系? he is helping the girl _____(穿) a blue blouse and a white skirt I don't know if she (will go ) to the movie.If she (goes),I'll tell you.为什么用will go,goes? LED光源中的色坐标和色温的关系是什么样的?色温低是否意味着颜色偏红黄,色温高是否意味着颜色偏蓝? 什么是色品坐标和色温的区别? 我想购买LED灯有色度坐标xy,但厂家要色温,怎样算色温. ( )will go to shanghai tomorrow.A.you,he and I B.you,him and me C.I,you and he D.he,you and I May be he will go to Shanghai tomorrow 错哪了 I don't know _________ he will come tomorrow._________ he comes,I'll tell you.选什么,为什么? I don't know if Mr.Green_______(come) tomorrow,but I will let you know if he _____(come) tomorrow LED色坐标怎么看色温的,比如色坐标是x=0.295,y=0.32.它的色温是多少呢? 想学:坐标、色温、显色指数含义,把“色度学基础”,我 q123718983 EMail:shicai_147@sina.com 这些国家的名字的英文 国家的名字.要中文也要英文的帮个忙.写出国家的名字.知道几个写几个.多一点好了.20个左右吧.= =.要中文的也要英文的.还有各个国家的首都的中英文也要写出来. last night 与yesterday的区别 多项选择:以下是一般过去时的时间状语有( ) A.yesterday B.tomorrow C.last year D.three dayes ago 英语有好评 .I don't know if he [],if he [],I will英语有好评 .I don't know if he [],if he [],I will tell him.A.comes ,comesB.will come ,comesC.comes ,will comeD.will come,will come 知识用英语怎么说 —— —— you know,—— —— you will find you don't know.要填四个单词