單項選擇題

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

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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

A.aground
B.at anchor
C.not under command
D.being towed