On offshore drilling units,emergency lighting and each emergency power system must be tested at least once a().
A、day
B、week
C、month
D、year
A、day
B、week
C、month
D、year
A、is drilling on the Outer Continental Shelf B、moves to a new drilling location in U-Swaters C、engages in a voyage to a port of another country which is a party of MARPOL D、All of the above
A、load line certificate B、Operations Manual C、Safety of Life at Sea Certificate D、Certificate of Inspection