AK20 means 80% nitric acid + 20% N2O4
AK = Azotna Kislota = Nitric Acid in
NASA
Similar to AK20
A&RC - Application and Resource Control
A&TA - Assembly and Test Area
A&V - Assembly and Verification
A/A - Air to Air
A/C - Aircraft
A/C - Associate Contractor
A/C - Air Conditioning
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