No. 6,685 in Russian
pdk
"PDK" in Russian is an abbreviation for "предельно допустимая концентрация," meaning "maximum permissible concentration."
In a sentence
Подкрепитесь перед дорогой, ведь путь будет долгий.
Have some food before the journey, as it will be long.
Here, the root 'подк' is part of the verb 'подкрепитесь' (have some food), derived from 'подкрепить' which means 'to support or reinforce oneself by eating'.
Подконтрольные территории должны подвергаться периодическим инспекциям.
Subordinated territories should undergo periodic inspections.
In this sentence, 'подк' serves as part of the word 'подконтрольные' (under control), indicating a level of supervision.
Этот план требует ещё подкреплений, чтобы стать реализуемым.
This plan requires further reinforcements to become feasible.
The root 'подк' in 'подкреплений' refers to reinforcements, stemming from the concept of 'supporting or strengthening'.
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