单选题Before leaving port on an ocean tow，a tug captain should assure himself of all the following EXCEPT（）.Athe towing hawser can be released quickly in an emergencyBthe correct navigation lights are rigged and operable on the tug and towCan insurance underwriter has prepared a pre-sailing surveyDa pick-up wire has been rigged on the tow in case of a breakaway
单选题
Before leaving port on an ocean tow，a tug captain should assure himself of all the following EXCEPT（）.
A
the towing hawser can be released quickly in an emergency
B
the correct navigation lights are rigged and operable on the tug and tow
C
an insurance underwriter has prepared a pre-sailing survey
D
a pick-up wire has been rigged on the tow in case of a breakaway
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