單項(xiàng)選擇題

Spreading oil on the open sea has the effect of（）.

A.diminishing the height of the seas
B.lengthening the distance between successive crests
C.increasing the height of the seas
D.preventing the wave crests from breaking

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單項(xiàng)選擇題

Sour crude oil（）.

A.contains high quantities of hydrogen sulfide
B.is diluted with other products for carriage
C.is lighter than other crudes
D.is less hazardous to load than other crudes

單項(xiàng)選擇題

Releasing oil from the sea anchor of a survival craft may（）.

A.keep the propeller from being fouled
B.increase propeller speed
C.help calm the waves in the vicinity of the craft
D.increase the holding power of the sea anchor

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Spreading oil on the open sea has the effect of（）.

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Sour crude oil（）.

Releasing oil from the sea anchor of a survival craft may（）.