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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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