A.the state of visibility
B.the traffic density
C.the number of crew on board
D.the maneuverability of the vessel
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A.a little deeper aft
B.a little deeper forward
C.at the same draught between fore and aft
D.a balance between two sides
A.same time
B.sea protest
C.report
D.accident
A.to plan
B.planning
C.for planning
D.in planning
A.to
B.for
C.on
D.over
A.gangs employed
B.windlass trouble
C.gangs unavailable
D.shortage of navigational charts
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（）is on the panel of radar.
What is it called when it is possible to ignite the vapour above the oil?（）
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
Manoeuvring information can not be obtained from（）.
Bales close to the deckhead should be covered to prevent（）.
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
What is a CORRECT reply to a pilot’s request, How’s your heading?（）
According to the relevant regulation, lifeboat should be powered by（）.
When steering by autopilot,how often should the steering be checked?（）