单项选择题

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

A.Green star rocket
B.Red star rocket
C.Orange smoke signal
D.Horizontal motion of a flag

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单项选择题

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

单项选择题

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

单项选择题

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