单项选择题

How does a vessel’s rate of turn change when entering shallow water?（）

A.It is faster
B.It is slower
C.There is no change
D.It remains constant for varying propeller revolutions

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How does a coast radio station communicating by HF radio normally identify itself?（）

A.By its subscriber number
B.By its call sign
C.By its MMSI
D.By its MID

单项选择题

How do you operate a portable CO₂ fire extinguisher?（）

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
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单项选择题

How do you determine the weight of the vessel that is supported by the ground when a vessel has run aground?（）

A.This requires extensive calculation and is usually performed only by a naval architect not by a ship's officer
B.Determine the point where aground and the draft at that point，then calculate it using the grounding formula
C.Use the hydrostatic tables and enter with the mean draft before grounding and the mean draft after grounding
D.Use the inclining experiment formula and substitute the change of trim for the angle of list