单项选择题
The purpose of inert gas systems aboard tank vessels is to（）.
A.allow sufficient oxygen in the tank to sustain life
B.prevent outside air from entering the tank
C.provide increase in cargo discharge pressure
D.comply with double hull pollution prevention regulations
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A.transfer containers without chassis
B.load the vessel with palletized cargo
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D.be loaded full and down to her marks -
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The piping that routes an oil cargo from the manifold to underdeck pipelines is known as a （）.
A.cargo fill
B.line drop
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A.the nature of the cargo being carried
B.changes in heading
C.major structural repair
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