which material is a mixture?以下哪一项是混合物?1）水（water）2）空气（air）3）甲烷（methane）4）镁（magnesium）

英语翻译The bipolar junction transistor consists of three regions of semiconductor material.One type is called a p-n-p transistor,in which two regions of p-type material sandwich a very thin layer of n-type material. which wood material is suitable for heated flooring? cork is a light brown material翻译 stone is a hard material.找动词 The box ___such material is made is very light and lasts long.A of which B from which C into which D up of which 答案是C 求解释原因. 英语翻译this area is in the materials elastic range.This is a range in which the material will return to its original length when the force is released. material determination?Hi peopleI have a scenario where my client wants 1.His customer to select a material if a certain material is not available2.The second material should be amongst a list of materials say 4/5 from which the customer can choose.3 ,which 语法but not that porosity is not the same as the permeability,which measures the ease with which water can flow through a material.能不能讲解一下这句which修饰那个,怎么理解,是什么句式啊? 英语翻译the story which was written by a middle school student is popular in schoolsthe building which was built last year is our classroomthe designer decided to change the material which was used ___ we shall bend this material into a ring is not yet decided?选项：A.Which B.Where C.Why D.Who 答案应该选哪一个? 英语翻译User subroutine USDFLD is called at each point for which the material definition includes a reference to the user subroutine. Which one of the following is the most common reinforcing material in FRPs?A.Al2O3B.carbonC.cobaltD.graphiteE.Kevlar 49F.SiO2 A lathe is a machine tool which spins(旋转) a block of material to perform various operations such 翻译下 急A lathe is a machine tool which spins(旋转) a block of material to perform various operations such as cutting,sanding（砂纸打磨 英语翻译A mere “dissolution”or “partitioning”model does not explain these results,because those compounds for which steady-state rejection is reached more slowly are also those for which rejection is lower and more material accumulates in The sweet sticky soft material produced bybees,which is eaten on bread.一个单词 2.Which size and which material is the most popular one?Why?中文我知道，那怎么回答呢？ Chinese culture and material progress,which is more important?The preservation of Chinese culture is more important or material progress?我不是要翻译 Bulk Material hi all,Does any one knows what is bulk material how to determine that it is a bulk material