acid-proof alkali-proof salt-proof

high grade moth-proof damp-proof sheep down quilt

water-proof and seepage-proof project

100p% firing level

4 corner tangential firing

50% firing energy

accuracy of firing

accuracy of firing data

ahead firing

air gun firing chamber

alternate firing

angle of firing

Annulus Pressure Firing

antiaircraft gun firing

approved shot firing apparatus

arc firing

area with easy firing and explosion

armament datum firing

Artillery firing