單項(xiàng)選擇題Which statement is TRUE when comparing cold and warm fronts?（）

A.Cold fronts are more violent and of shorter duration
B.Cold fronts are milder and last longer
C.They are very similar with the exception of wind direction
D.Warm fronts are more violent and of longer duration


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1.單項(xiàng)選擇題The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.

A.variation
B.compass error
C.deviation
D.earth‟s magnetic force

2.單項(xiàng)選擇題You are standing the wheelwatch on entering port and the master gives you a rudder command which conflicts with a rudder command from the pilot.What should you do?（）

A.obey the master‟s
B.obey the pilot‟s
C.bring the rudder to a position midway between the two conflicting orders
D.ask the pilot if he relinquishes control

3.單項(xiàng)選擇題（）is used for lifting cargo.

A.A mooring winch
B.A windlass
C.A deck crane
D.A lifeboat

4.單項(xiàng)選擇題The original equilibrium position is stable when（）.

A.metacentric height is positive
B.metacentric radius is positive
C.KG exceed maximum allowable limits
D.Free surfaces are excessive

5.單項(xiàng)選擇題Emergency escape breathing device on board shall have a duration of service no less than（）.

A.20 minutes
B.15 minutes
C.10 minutes
D.5 minutes