A.The tank is safe to enter
B.The tank is especially dangerous to enter
C.Carbon monoxide is present
D.Water vapor present when the tank was sealed has oxidized
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A.class A
B.class B
C.class C
D.class D
A.steel surfaces consume oxygen by rusting
B.sealed tanks usually form a vacuum
C.moisture condenses in the tank, displacing the oxygen
D.most tank coatings give off poisonous vapors in the presence of moisture
A.until each quadrennial PSC inspection
B.until the end of each voyage
C.for a minimum of one year
D.for a minimum of two years
A.the most common method used in the United States
B.too expensive for common use
C.generally safe to sea life
D.generally harmful to sea life
A.the "snow" which is sometimes discharged along with the gas is toxic
B.prolonged exposure to high concentrations of C02 gas causes suffocation
C.rapid dissipation of the C02 vapor
D.the C02 gas is lighter than air and a large amount is required to extinguisha fire near the deck
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