A.A power-driven vessel
B.A vessel engaged on pilotage duty
C.A vessel dredging
D.A vessel restricted in her ability to maneuver
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A.not under command
B.being towed
C.on pilotage duty
D.aground
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Daymarks marking the starboard side of the channel when going towards the sea are（）.
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
A power-driven vessel underway shall keep out of the way of（）.
By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.
A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.
According to the Rules，when should lights be displayed?（）.
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
A towing light is a yellow light having the same characteristics as a(n)（）
A single towing light will be carried above a vessel’s sternlight（）.