All ships of 50,000 gross tonnage and upwards shall have:( )_ _
A.4 CO2 fire extinguishing system B.horizontal zone C.main vertical zone D.a rate of turn indicator to determine and display the rate of turn正确答案D
All ships of 50,000 gross tonnage and upwards shall have:( )_ _
A.4 CO2 fire extinguishing system B.horizontal zone C.main vertical zone D.a rate of turn indicator to determine and display the rate of turn正确答案D
