單項選擇題

What is the lifesaving signal for You are seen -assistance will be given as soon as possible?（）

A.3 white star signals
B.Horizontal motion with a white flag
C.Vertical motion of a white light
D.Code letter K by blinker light

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單項選擇題

Under the forces of its own weight，the suspended length of line will fall into a shape known as a（）.

A.polygon
B.holding arc
C.catenary curve
D.parabolic curve

單項選擇題

There has been a collision in sea area of Fork.（）.

A.Stand by to give assistance
B.Stand by to alter course
C.Stand by to stop engine
D.Stand by to go astern