物理性有害因素

什么叫做共轭烯烃? HACCP的作用及意义 HACCP是指什么? HACCP是什么? 什么是HACCP 什么事haccp,具体是指什么? survey on 和 survey of 的区别请问一下survey on 和 survey of 有什么区别么?是说一个加调查的物,一个加调查的人么?谢谢. 黄酮类化合物为什么显酸性?不同羟基取代的黄酮其酸性强弱有何规律?碱溶酸沉法提取黄酮类化合物时,常用的碱液有哪些?各有何特点?试以大黄粉为原料,列出用不同强度的碱分离出几种酸度 英语翻译,拜托了With the global warming getting worse,more people choose to live a low— carbon life for the purpose of reducing greenhouse gases.As students ,we dot better save as much water ,paper paper and electricity.as We can we should us 英语翻译英语翻译1.我们对电影进行了讨论.We had ____ ___ ___ the movie.2.我可以在房间里吸烟吗?___ ___ ___ in the room?3.我们的城市有越来越多的游客.There ___ ___ ___ visitors in our city. I need to go there to make a first contact.--Translate to Mandarin1)我必须去那里做第一个联系. 英语翻译Fit the net to boit the powder.(Note:not to make it too loose or There is two ways to make these machines,but the first it worthy of note.这里的note是什么意思. note-making;note-taking这两个有什么区别? 辨析同义词!请从现代汉语学的角度来分析：同义词的辩析包括从意义,用法和附属色彩三方面来辨析!爱好－嗜好；赋予－给予；规划－计划；改正－改进；辽阔－广阔；颁布－公布；体格－ the ( ) horse ran away from the ( )homeA.frightened,burning B.frightening ,burning 为什么选A呢,我选B的 灯泡L1和L2串联,灯泡L2并联一个电压表,发现灯泡L1和L2都不亮,电压表有示数,是什么原因?A:L1断路,L2短路B：L1断路,L2断路C：L1短路,L2断路D：L1短路,L2短路 ______ of his wife's constant complaint ,he ran away from home.A.Tired B.Tiring C.To tire D.To be tired 辨析同义词“对于”“对”的异同大致可以从词性、词义、搭配、句式等几个方面去考虑 串联和并联电路中短路和断路有什么情况发生,如灯亮不亮,电流表有无示数、电压表有没有示数（格式如下）短路： 短路：串联{ 并联{ 某工程甲独做要7天,乙独做9天,两人合作3天后,剩下的甲独做要几天? 一项工程,甲做需要7天,乙做需要9天,丙做需要5天,三人合作需要多少天? my wife and I had just finished the 150-mile trip home from our daughter's college.It was the first time in our lives that she would be gone for any length of time.We wondered how other people had survived it. ( )有礼（）有名（）有词（）玉立（）大方（）然失色（）然不顾（）然不动（）然成风（）然不同（）然自若帮我补充一下成语‘谢谢 玻璃加工的四大稳和四小稳是什么 玻璃熔窑都有哪些部分需要冷却啊 A ufo flew over my head while I was waking toward the bus stop yesterdayA UFO flew over my head while I was waking toward the bus stop yesterday 为什么是 A UFO flew ,不是 A UFO was flying呢?while引导的时间状语从句不是主从句都 A UFO flew over my head while I was walking to ward the bus stop yesterday. ___ the way,I saw a UFO yesterday. 英语翻译英语翻译 她似乎病了.She____ _____ _____\She_____ _____一个是两个空的一个是三个空的看,机器人似乎动了都要用到seem 请问大家招代理是啥意思 分招是什么意思