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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
