单项选择题
A.Test the pressure gauge for correct reading
B.Weigh the cartridge
C.Replace the dry chemical
D.Pressure test the discharge hose
单项选择题 Where would you find the “call sign” or “call letters”of the radio station on your rig?（）
单项选择题 Where would you find a list of the lifesaving equipment onboard your supply boat? （）
单项选择题 Where are the test certificates，for wire rope used as cargo runners，and loose gear certificates usually maintained? （）