單項(xiàng)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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單項(xiàng)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

單項(xiàng)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