negative control
| sample
| negative control | |
| med. pharma. | negatívna kontrola |
| sample | |
| scient. | vzorka |
| sampling | |
| commer. polit. | výber vzorky |
| |||
| negatívna kontrola | |||
|
negative control : 2 phrases in 2 subjects |
| Chemistry | 1 |
| Health care | 1 |