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單項(xiàng)選擇題

After the passage of a cold front the visibility（）.

A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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