The class of fire on which a blanketing effect is essential to extinguish the fire is
A.Class 'A'
B.Class 'B'
C.Class 'C'
D.Class 'D'
第1题
A.convection
B.conduction
C.radiation
D.direct contact
第2题
A.when the remaining charge volume is less than 90 percent of the required volume
B.at each inspection for certification
C.at each annual inspection
D.when the weight loss exceeds 10% of weight of charge
第3题
A.Make an entry in the official logbook
B.Open the master control valves on the fixed CO2 system
C.Start the fire pump and check discharge pressure
D.Secure auxiliary condenser overboard discharge
第4题
A.smoke density has been decreased sufficiently to see the bulkhead opposite the compartment's entrance
B.a lifeline and explosion proof flash light are used
C.all smoke and toxic fumes are removed and an adequate oxygen supply is present
D.overhaul has been completed to remove any possible source of re-ignition
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