两瓶法测定溶解氧适用于含量为( )的水样。A.2~100mg£¯LB.2~100μg£¯LC.>20μg£¯LD.<20μg£¯L

两瓶法测定溶解氧适用于含量为( )的水样。

A．2~100mg/L

B．2~100μg/L

C．>20μg/L

D．<20μg/L