单项选择题

During jacking operations and transit，empty void spaces in the hull of a jack up ship provide（）.

A.buoyancy
B.extra storage space
C.additional tank capacity
D.reduced stability

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During daylight savings time the meridian used for determining the time is located farther（）.

A.east
B.west
C.east in west longitude and west in east longitude
D.west in west longitude and east in east longitude

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During a period of “whiteout”，you should expect which of the following?（）

A.Snowfall or blowing snow
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C.Harsh contrast between sun-illuminated snow cover and the background
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Don’t（） this news to the public until we give you the go-ahead.

A.release
B.relate
C.relieve
D.retain