单项选择题

Any extinguishing agent used on a Class “C” fire must have which important property? （）

A.Cooling ability
B.Leaves no residue
C.Penetrating power
D.Nonconductivity

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单项选择题

A.Scorpio
B.Corvus
C.Libra
D.Corona Borealis

单项选择题

A.inflatable buoyant apparatus type
B.buoyant apparatus type
C.life float type
D.Any of the above types are acceptable

单项选择题

A.Masthead lights and sidelights
B.One sidelight，the masthead lights and stern light
C.Both sidelights
D.Stern light