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單項(xiàng)選擇題

A position obtained by applying ONLY your vessel’s course and speed to a known position is a （）.

A.fix
B.dead-reckoning position
C.running fix
D.probable position

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單項(xiàng)選擇題

A polyconic projection is based on a （）.

A.plane tangent at one point
B.cylinder tangent at one parallel
C.cone tangent at one parallel
D.series of cones tangent at selected parallels

單項(xiàng)選擇題

A pilot vessel on pilotage duty at night will show sidelights and a stern light （）.

A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown