Than the concentration of reference solution is used in a concentration of 1 quality control, it can be found below, where the concentration of the added quality control sample concentration 1, can not be predetermined
The concentration of the reference solution used is medium concentration QC 1, can be found below, here is added to the medium concentration of QC 1 sample concentration, so it can not be specified
The concentration of the reference solution used is medium concentration QC 1. It can be found below that the sample concentration of medium concentration QC 1 is added here, so it cannot be specified<br>