单项选择题

A line of position derived from a loran reading is a section of a(n) （）.

A.straight line
B.arc
C.parabola
D.hyperbola

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A light used to signal passing intentions must be an （）.

A.all-round yellow light only
B.all-round white light only
C.all-round blue light only
D.alternating red and yellow light

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A light signal consisting of three flashes means （）.

A.I am in doubt as to your actions
B.My engines are full speed astern
C.I desire to overtake you
D.I am operating astern propulsion

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A liferaft which has inflated bottom-up on the water（）.

A.should be righted by standing on the carbon dioxide cylinder，holding the righting straps and leaning backwards
B.should be righted by standing on the life line，holding the righting straps leaning backwards
C.will right itself when the canopy tube inflates
D.must be cleared of the buoyant equipment before it will right itself