单项选择题
Which nautical charts are intended for coastwise navigation outside of outlying reefs and shoals（）.
A.Approach charts
B.General charts
C.Sailing charts
D.Coast charts
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单项选择题
Which instrument is used to predict the approach of a low pressure system（）.
A.Anemometer
B.Fathometer
C.Barometer
D.Thermometer -
单项选择题
Which effect does speed through the water have on a vessel which is underway in shallow water （）.
A.A decrease in the speed results in a decrease in steering response and maneuverability
B.An increase in speed results in the stern sucking down lower than the Bow
C.An increase in speed results in the vessel rising on an even plane
D.A decrease in speed results in the vessel sucking down on an even plane -
单项选择题
When liquid is free to move transversely in a tank，the effect is called（）.
A.free communication
B.free density
C.free surface
D.negative GM
