今年中国会开战吗

欲配W NaCL=10%.溶液500g,如何配置? 热辐射问题一切物体都在热辐射,而热辐射会使物体温度升高,问题一,这是否能认为对外做功,.二,热辐射的能量是哪来的,如果是吸收来的,那是否可以说一切物体都有种能量减少的趋势,那这些 0.3%Nacl溶液 ,0.3%指的是什么浓度呢?怎样配制?是指的质量浓度吗? 制备500ML质量分数为0.5%的氯化钠溶液怎么配?溶液密度怎么办?还是直接按质量配,例如配制500g而不是500ml. 关于热辐射的问题我学完高中的布朗运动以后有一些问题:内能,他的本质实际上就是大量分子的无规则运动.或者换句话说,分子各自的动能和势能,就是机械能,很小很小,当他们成千上万地集合 一个关于热辐射的问题假设这样一个系统,有一个圆柱腔,内部抽真空,内壁为镜面.圆柱顶面和底面分别为黑体与实际物体,该实际物体不为漫灰体,且α不等于ε.系统温度均为500K.根据网络法求解 A和B为两个相同的物体,具有相同的温度,但A周围温度低于A,而B周围温度高于B,试问两个物体在单位时间内辐射的能量和吸收的能量是否相等?A和B的辐射是平衡热辐射吗?主要是前一问, 一个热辐射的问题一个卫星在地球附近,但不在地球的阴影中,卫星的主体假设是直径为1m的球,太阳表面温度Ts=6000K,太阳半径Rs=6.96*10^8m,太阳到地球距离d=1.5*10^11m.当卫星在阳光中升达某一温度 书上说当温度升高时,热辐射中较短波波长的成分越来越强,还举了个铁块加热变红的例子,我纠结为什么波长变短了不是变紫色而是变红呢,红色波长不是长吗? 括号里的是选项1、已知X和Y满足X-3Y-5=0,则式子X-6Y+5的值是【15、10、5、0】2、一列长150米地火车,以每秒15米的速度通过600米的隧道,则这列火车从刚进入隧道到完全通过隧道所需的时间是【60秒 关于英语（street）的简写做名片的时候,背面是英文的,地址翻译的时候,英文中的“街道”可以简写成str吗? 英语好的进in the middle of与in middle of 有什么区别 英语MIDDLE是什么意思In the middle of the wall 这句英文怎么翻译成中文? 英语中在街道前面用那个介词 on the street还是in the street我明天就要考英语了 英语专家进来答 和尚撞钟者勿扰 英语选择题?（括号里的是选项,高手来!）①Waiter!（）?I can't eat this.It's toosalty.A.Yes,sir B.What C.All right D.Pardon②All the members in our group（）football.A.likes B.do likes C.does likes D.like③The composition needs 一道英文谚语选择题（有点类似连线的那种,把正确的答案填在括号里）1.It takes all sorts to make a world( )2.Give and take( )3.No pains,no gains( )4.Dog does not eat dog( )5.The early bird eatches the worm( )6.Well begun is This pair of shoes is for you,and that ---- is for MaryA one B shoes C pair D shoe 说明理由 但我好像隐隐约约记得老师说过 pair of 不可以用one 代替的 正确率要求90%以上,（ ）11.Won’t you let _____ help you?A.I and my friend to B.my friend and IC.my friend and me D.my friend and I to（ ）12.Your bag is different _____ mine.A.to B.with C.from D.for（ ）13.There _______ a packet of ship 七年级的英语句型转换题,正确率要求90%以上,句型转换.1.Daniel is going to study French.(改为否定句) Daniel ___________ __________ to study French.[来源:Z.xx.k.Com]2.My computer is broken.(同义句)Something is ___________ _ 七年级的英语阅读理解题,正确率要求90%以上,　　There are seven days in a week.They are Sunday,Monday,Tuesday,Wednesday,Thursday,Friday and Saturday.Most children go to school from Monday to Friday.Most people don’t work on Saturda 横线上的答案是神马 速回!The owner of this shoe shop doesn't ﹎﹎﹎ the price,so you can bargainA.ask B.answer C.tell D.set 2.The market sells many different kinds of ﹎﹎﹎,such as books ,watches and bags.A.clothes B.goods C.fruits D 单项 “跟着读”用英语怎么说?不要follow me或是read after me.不是跟我读，是让学生跟着录音机读，应该怎么说？ Betty’s aunt lives in San Francisco.She knows something about China on television.But she wants to know more.So she is looking forward to visiting China.She has got a holiday next week.She is going to visit Beijing because she likes Chinese culture 七年级的英语阅读理解题,正确率要求87%以上,What is a good friend like?MollyI think a good friend likes to do the same things as me.Jack is my best friend.We both like to play the guitar after class.HollyFor me,a good friend makes me l 1.--He wants to have____word with you .--I know,___word has come that I am the next person he wants to talk to .a,/ 我选 a,the2.My parents always hold that time should be made good use of ____my lessons well.to learn 我选 of learning3.The result 1.They talked for about an hour of things and persons __C___ they remembered inthe school.A.which B.that C.who D.whom2.Who ___A__ has common sense will do such a thing?A.which B.who C.whom D.that3.All the apples __A___ fell down were eaten by the pig 27.She wants to know whether the measures to be taken have been ___________ .A.agreed for B.agreed with C.agreed upon D.agreed over 选哪个 原因是什么 其他几项怎么用 “大家跟我一起做”英语怎么说 让我们一起阅读（看）吧!用英语怎么说? 太阳为什么是热辐射?它的媒介是不是宇宙空间的物质呢?太阳和地球之间为什么没有介质啊? 热辐射是否需要介质?如需要,请简单说明为什么太阳光照射下能感觉热?