不透光烟度计是用于连续测量汽车排气的()的仪器。
A.CO
B.HC
C.光吸收系数
参考答案:C
Let’s call it a day. ____where we’ll get the funds, we’ll talk about that later.
A.In common with
B.On behalf of
C.In place of
D.As to
原子吸收分析中常用( )配制溶液。
A.一级水
B.二级水
C.三级水
D.四级水