At night while the ship is tied up to the dock，a fire breaks out in a cargo hatch. After sounding the alarm，what should the person on watch do?（）

单项选择题As compared to carbon dioxide，dry chemical has which advantage?（）.

A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect

单项选择题As an extinguishing agent，foam（）.

A.conducts electricity
B.should be directed at the base of the fire
C.is most effective on burning gases which are flowing
D.extinguishes by cooling oil fires below ignition temperature

单项选择题Any ship damaging a pipe could（）an immediate danger of fire.

A.meet
B.face
C.be in font of
D.follow

单项选择题Any firefighting equipment that is carried in addition to the minimum required must（）.

A.meet the applicable standards
B.be marked as additional equipment
C.be stowed in a separate area
D.All of the above

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