单项选择题
Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
A.Slightly higher fuel consumption
B.Lack of directional control when backing
C.Inefficient at high shaft RPM
D.Some unusual handling characteristics
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相关考题
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单项选择题
Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location? （）
A.A long swell from an unusual direction
B.A lengthy lull in the wind and seas
C.Large seas coming from different directions
D.A brisk chop from the southeast -
单项选择题
When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）
A.Excessive pitching
B.Excessive yawing
C.Excessive rolling
D.No change should be evident -
单项选择题
When taking soundings on a floating ship，the tape should be lowered and brought back quickly to（）.
A.reduce the time the sounding tube is open
B.avoid creating a spark
C.lessen the effect of roll or pitch on the reading
D.lessen the effect of heave on the reading
