單項(xiàng)選擇題After you enter the Ohio River at Cairo，the Map shows that the deepest water under the Illinois Central RR Bridge would be found under which span? （）

A.Right Descending Bank span
B.Left Descending Bank span
C.Center span
D.Water is equal under all spans


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1.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

3.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

4.單項(xiàng)選擇題After reporting a casualty to a mobile offshore drilling unit，which record must be retained on board? （）

A.Record of drafts
B.Hull reports
C.Anchor record
D.Machinery repair book

5.單項(xiàng)選擇題After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean? （）

A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak