單項選擇題In nautical terminology a dog is a（）.
A.crow bar
B.device to force a water tigh door against the frame
C.heavy steel beam
D.wedge
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1.單項選擇題In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system , there must be（）.
A.fuel
B.oxygen
C.ignition
D.All of the above
2.單項選擇題In order to correctly open a new coil of manila line,you should（）.
A.pull the tagged end from the top of the coil
B.pull the tagged end through the eye of the coil
C.secure the outside end unroll the coil
D.unreel the coil from a spool
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The dew point temperature is（）.
題型：單項選擇題
The mean draft of a ship is the draft（）.
題型：單項選擇題
Which of the following shall not the officers in charge of the navigational watch do?（）
題型：單項選擇題
Which of the following is not an operation mode of AIS?（）
題型：單項選擇題
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
題型：單項選擇題