单项选择题 A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.

单项选择题 A vessel is equipped with a single right-handed screw. With rudder amidships and calm wind，the vessel will most likely back（）.

单项选择题 A vessel is considered to be restricted in her ability to maneuver under the Rules if she is （）.