Periodic surveys to renew the load line assignment for a ship must be made at intervals not exceeding().
If some surveys refer to statutory survey and ship classification survey but occur temporarily, we call them ()
Which statement about active and passive surveys is incorrect?()
If some surveys refer to statutory survey and ship classification survey but occur temporarily, we call them ()
Surveys show that ______ less sleep than we think, ______ too much sleep could even harm our health.