【单选题】某化合物的浓度为1.0×10-5mol/L,在380nm时, 有透射比为50%, 用1.0cm吸收池, 则在该波长处的摩尔吸收系数为
【简答题】A.They begin paying federal taxes from that day. B.It is the last day for people to pay the city tax. C.It is the deadline for paying federal taxes. D.The state tax is due on that day.
【单选题】––How was your last day off? ––_______. It was windy and cloudy all day.
【单选题】给一个已存在的文件用FileWriter("report")给其写入数据,则结果为?
【单选题】给一个已存在的文件用 FileWriter("report") 给其写入数据,则结果为 ?
【单选题】某化合物的浓度为1.0 ×10-5mol/L,在lmax=380nm时, 有透射比为50%, 用1.0cm吸收池, 则在该波长处的摩尔吸收系数emax /[L/(mol×cm)]为
【单选题】某化合物的浓度为 1.0 × 10 -5 mol/L, 在 l max =380nm 时 , 有透射比为 50%, 用 1.0cm 吸收池 , 则在该波长处的摩尔吸收系数 e max /[L/(mol × cm)] 为