單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip