单项选择题
In towing it is desirable for the tug and the vessel to ride wave crests simultaneously because（）.
A.shock loading on the tow line is reduce
B.towing speed is improved
C.the vessel is more visible from the tug
D.the catenary of the tow line is reduced
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In order to back a right-handed，single-screw vessel in a straight line，you will probably need to use（）.
A.very little rudder
B.some left rudder
C.some right rudder
D.full left rudder -
单项选择题
In order for a vessel to be engaged in fishing she must be（）.
A.underway
B.using gear which extends more than 50 meters outboard
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单项选择题
In ballasting to survival draft，while in transit，due to extreme wind and wave loads，thrusters or propulsion，if available，should be used to（）.
A.reduce windward mooring tensions
B.maintain vessel heading
C.maximize accelerations
D.increase speed of advance
