單項選擇題A tank which has been sealed for a long period of time can be dangerous because （）.

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


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1.單項選擇題Records of garbage disposal are required to be maintained （）.

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

2.單項選擇題The use of sinking and dispersing agents for the removal of surface oil is （）.

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

3.單項選擇題One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.

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

4.單項選擇題A fire involving aluminum powder would be a class （）.

A."A" fire
B."B" fire
C."C" fire
D."D" fire

5.單項選擇題Which of the following components provides a direct source of seawater for the fire main system?（）

A.Rose box
B.Sea chest or spool piece
C.Sluice valve
D.Fire pump stuffing box