Is oxygen the only gas( ) helps fire burn?Is oxygen the only gas( ) helps fire burn?A.it B.which C.不填 D.that

Is oxygen the only gas( ) helps fire burn?Is oxygen the only gas( ) helps fire burn?A.it B.which C.不填 D.that Is oxygen the only gas____helps fire burn?A.that.B./.C.which.D.it Is oxygen are the only gas____ helps fire burn?A.thatBwhichC.it为什么不能选B? A compound contains only carbon,hydrogen,and oxygen.Combustion of 10.68 mg of the compound yields 16.01 mg CO2 and 4.37 mg H2O.The molar mass of the compound is 176.1 g/mol.What are the empirical and molecular formulas of the compound?(Type your answ 英语化学求分子式和试验试!A compound contains only carbon,hydrogen,and oxygen.Combustion of 10.68 mg of the compound yields 16.01 mg CO2 and 4.37 mg H2O.The molar mass of the compound is 176.1 g/mol.What are the empirical and molecular for the amount of substance of oxygen atoms is Combustion of a 0.9835-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.900 g of CO2 and 1.070 g of H2O.a.What isthe empirical formula of the compound? 用适当的关系词填空 Who______knows him wants to make friends with him?This is the hour_____theplace is always full of women and children.Is oxygen the only gas_____helps fire burn? 英语翻译category of premise is fire hazardous.solid combustible and hard combustible substances and materials,whice are capable only to burn when reacting with oxygen of the air or interacting with each other,are circulating in the premise.这句 we take harmful gas from the air and g(----) off oxygen 英语翻译The Method2.1 Biochemical Oxygen Demand (BOD)The biochemical oxygen demand (BOD) of waste water,industrial effluents and surfacewater is an expression for the amount of oxygen consumed by the decomposition oforganic matter in a biochemica 作业是英文的,xxx+oxygen=carbon dioxide+xxxthe equation below shows the process in cells in which oxygen is used and carbon dioxide is produced osmosis involves the movement ofa oxygen molecules onlyb carbon dioxide molecules onlyc liquid molecules onlyd water molecules only 英译汉一句 thanks1.5 Since the rate of combustion is closely dependent upon the concentration of oxygen present,an enriched oxygen atmosphere (greater than 21% vol) becomes a hazard. Only she is the It is the only the only is It is the only.