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单选题
A tug in irons is（）.
A
rudder bound
B
being tripped by the towline
C
unable to maneuver
D
broached
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单选题A tug is “in irons” when held in a fixed position by（）A
the weight of its tow，its being anchored，or groundedB
the weight of its towing hawser on the bottomC
an adverse currentD
lack of power or an engine breakdown
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单选题The catenary（）.A
acts as a reserve length of towing hawser when the tug applies more power，and it dampens the surge effect of the towB
gives an approximation of the amount of strain on the towing hawserC
is the dip in the towing hawser between the tug and the towD
All of the above
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单选题A tug would NOT assist a ship to steer if the tug is made up to the large vessel（）.A
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单选题To reduce the amount of catenary you may（）.A
shorten the hawser or increase the tug's speedB
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单选题You are under sail and overtaking a tug and tow.Which action is correct（）.A
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Both vessels are required to maneuver to avoid collision
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