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單項選擇題

If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.

A.pushed ahead
B.towed alongside
C.towed astern
D.Any of the above

單項選擇題

How does the effect known as bank suction act on a single-screw vessel proceeding along a narrow channel?（）.

A.It pulls the bow toward the bank
B.It pushes the entire vessel away from the bank
C.It pulls the stern toward the bank
D.It heels the vessel toward the bank