The Master to prosecute all voyages with the utmost（）and to render customary assistance with the Vessel’s Crew.

A.cable tension
B.water temperature
C.bottom conditions
D.water density

A.carry at least two injured persons
B.float for at least two hours
C.be used on the types of helicopters serving the unit
D.All of the above

A.vertical motion of white flags
B.vertical motion of a white light or flare
C.firing of a green star signal
D.None of the above