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單項選擇題

Static electricity may be built up by the（）.

A.flow of petroleum through pipes
B.spraying or splashing of petroleum
C.settling of solids or water in petroleum
D.All of the above

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單項選擇題

Permission is kindly requested（）the ballast water.

A.pump out
B.to pump out
C.pumping out
D.be pumped out

單項選擇題

On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.

A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity

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Static electricity may be built up by the（）.

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Permission is kindly requested（）the ballast water.

On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.

On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.