單項選擇題

A red triangular daymark marks（）.

A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.area of a channel where passing another vessel is permitted

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單項選擇題

A power-driven vessel，when towing astern，shall show（）.

A.two towing lights in a vertical line
B.a towing light in a vertical line above the sternlight
C.two towing lights in addition to the sternlight
D.a small white light in lieu of the sternlight

單項選擇題

A power-driven vessel underway shall keep out of the way of（）.

A.a vessel restricted in her ability to maneuver
B.a vessel under command
C.a passenger ship
D.a seaplane on the water

A red triangular daymark marks（）.

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A power-driven vessel，when towing astern，shall show（）.

A power-driven vessel underway shall keep out of the way of（）.

A power-driven vessel，when towing astern，shall show（）.