单项选择题
A.Right Descending Bank span B.Left Descending Bank span C.Center span D.Water is equal under all spans
After the passage of a cold front the visibility（）.A.do...
单项选择题After the passage of a cold front the visibility（）.
A.does not change B.improves rapidly C.improves only slightly D.becomes poor
After the initial cleaning of flue gas in an inert gas ...
单项选择题After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?（）
A.Scrubber B.Demister C.Deck water seal D.Final filter
After sending a message describing the symptoms of an i...
单项选择题After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means “（）”.
A.Apply ice-cold compress and renew every 4 hours B.Commence artificial respiration immediately C.Give enema D.Pass catheter into bladder
