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

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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