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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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