I()having your approval for the routine maintenance at your earliest convenience.
I hereby request permission to()the ship hull for routine maintenance.
Which of the routine maintenance procedure listed is required for starting air receivers?()
Routine radio communications should be no more than().
Routine monitoring of a diesel engine should include ().
NAVTEX系统播发电报优先次序的标志是()。①VITAL;②IMPORTANT;③ROUTINE;④URGENT;⑤SAFETY;⑥MAYDAY