單項選擇題The head of the bend is the().

A.top or upstream beginning of a bend
B.bottom or downstream beginning of a bend
C.midpoint or center radius of a bend
D.center line or apex of a bend


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1.單項選擇題The firing of a red star signal may mean().

A.This is the best place to land
B.You are seen - assistance will be given as soon as possible
C.Tail block is made fast
D.Slack away

2.單項選擇題The Coordinator Surface Search in a SAR situation should display by day().

A.the code flags FR
B.a black ball over a black diamond shape
C.code flag Quebec over a black ball
D.two black diamond shapes in a vertical line

3.單項選擇題Some sea water came into the wheel house during the voyage due to()the window thereof.

A.not close
B.not closing
C.we didn't close
D.not to be closed

4.單項選擇題If your vessel is dragging her anchor in a strong wind,you should().

A.shorten the scope of anchor cable
B.increase the scope of anchor cable
C.put over the sea anchor
D.put over a stern anchor

5.單項選擇題Production of mechanical foam by a portable in-line foam proportioner().

A.increases the size of foam bubbles formed
B.increases the rate of foam production
C.improves the extinguishing properties of foam
D.gives the nozzleman more freedom of movement,since it can be placed anywhere in the hose line