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
单项选择题 During daylight savings time the meridian used for determining the time is located farther（）.
单项选择题 During a period of “whiteout”，you should expect which of the following?（）
单项选择题 Don’t（） this news to the public until we give you the go-ahead.
