When may the automatic identification system (AIS) be switches off? ____(1.0)
A.at anytime as long as it is properly logged B.at the master’s professional judgment C.only when the vessel is at anchor or in port D.under no circumstance正确答案B
When may the automatic identification system (AIS) be switches off? ____(1.0)
A.at anytime as long as it is properly logged B.at the master’s professional judgment C.only when the vessel is at anchor or in port D.under no circumstance正确答案B
