初三上册作业本人教版2015

He found that it was hard to learn a foreign language.同义句He found _____ ______ _____learn a foreign language. Jim found it difficult to go to sleep 变为同意句It is hard for Jim to___ ___. 分光光度计的问题,（比色杯）在使用分光光度计的时候,测出的值偏小,是什么原因呢?还有,要是比色杯的磨砂面对到了光源,会不会使结果变小? 怎么洗比色杯 he found it hard to get to sleep.改为同义句 It is— — him to fall asleep. 9m十27m立方等于多少 一列火车长160米,全车通过440米的桥需要30秒,求火车每秒钟行多少米?用方程 一列火车长160米,全车通过440米的桥需要30秒,求火车每秒钟行多少米? 一列火车长160米,全车通过440米的桥需要32秒,这列火车每秒行多少米? 在含盐30%的盐水x千克中,注入20%的盐水y千克,此时盐水含盐 （ ）A (X+Y)千克 B （x-y)千克 C （0.3x+0.2y)千克 D【(0.3x+y)*0.2】千克*是乘号 【】是大括号 若平行四边形的一条边被一个内角的平分线所分成的两条线段的长度分别为4cm和5cm,则该平行四边形的周长为________cm. I find it hard to solve the problem.翻译 一个英语题''''he found ------very different -------the problem. A that to solve B thi...一个英语题''''he found ------very different -------the problem. A that to solve B this solving. C himself. solve. D it. to. solve. g=10N/kg It was not until dark that she found that she thought was the correct way to solve the problem.这句话怎么翻译? I find that it it hard for him to work out the problem.句型转换I find __ __ for __ to__the problem__. 光程与光程差的实际应用及其研究的物理意义 双缝干涉实验中的光程差问题.如图所示,在双缝干涉实验中SS1=SS2.用波长为 的光照射双缝S1和S2.通过空气后在屏幕E上形成干涉条纹.已知P点处为第5级明条纹,则S1和S2到P点的光程差为?若将这个 什么是“光程差” EDTA 与EGTA的区别? 波动光学 为什么光程差2nd?半波损失呢?大学物理 波动光学 为什么光程差2nd?半波损失呢? 光程差的计算一束光由空气垂直射入薄膜,形成干涉条纹,那么光程 差应该是 2ne+半波长 还是2ne-半波长 ,为什么? EDTA和EGTA哪个毒性大?它们对土壤中重金属的螯合作用哪个更强，对土壤和植物的毒性哪个更强？ EDTA和EGTA分别是什么离子的螯和物 谁帮我出几道综合算式题? 1M等于几MB 一枚闪亮的硬币阅读答案 急需啊! 大家帮帮我这几道题目吧,谢谢了! （全部要算式）一辆汽车从A城开往B城,第一小时行了全程的四分之一,第二小时行了60千米,这时已行的路程与全程的比是1:3,A、B两城相聚多少千米?2.网页营业 .写下算式1.一建工程,甲、乙两个工程队各作需6天完成,甲队单独做需15天完成,乙队单独做需多少天完成?2.鸡兔同笼,共有足206只,兔比鸡少52只,则鸡多少只,兔多少只.3.鸡兔共200只,鸡的脚比兔的 英语翻译Good-bye John Macy,I'll soon be with you,good-bye,I loved you.I wanted to be loved,I was lonesome.Then Helen came into my life,I wanted her to love me and I loved her.Then later Polly came and I loved Polly and we were always so happy tog I naive to think that some things.Enough to make me forget you make enough time 和spare enough time 有什么区别?