3,5B.r2-PA.DA.T分光光度法测定水中银含量时,水样叮对于银含量20含倍的铬(III)对测定无干扰。
参考答案:对
—I’ll do the washing-up. Jack, would you please do the floors?
—______.
A.Yes, please
B.No, I don’t
C.Yes, sure
D.No, not at all
乌克兰重工业发达,其丰富的矿产资源是( )
A.煤
B.铁矿
C.石油
D.铜