航海英语船舶操纵基本知识单项选择题每日一练(2018.09.09)

单项选择题
While moving ahead，a twin-screw ship has an advantage over a single-screw ship because （）.
A.correct trim will be obtained more easily
B.drag effect will be cancelled out
C.side forces will be eliminated
D.speed will be increased
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（）.
A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，sternlight and towing light
D.All of the above
单项选择题
At night，a vessel shall indicate that she is restricted in her ability to maneuver by showing in a vertical line two（）.
A.red lights
B.red lights and two white lights
C.red lights with a white light in between
D.white lights with a red light in between
单项选择题
When towing astern，one way to reduce yawing of the tow is to（）.
A.trim the tow by the stern
B.trim the tow by the head
C.have the tow on an even keel
D.list the tow on the side it is yawing
单项选择题
Catenary as applied to tow lines denotes the（）.
A.dip of the line
B.stretch of the line
C.strain on the line
D.length of the line