A.six weeks
B.six months
C.twelve months
D.two years
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A.the name of the unit on which it is located
B.the date that it was installed on the unit
C.the names of the individuals qualified to use it
D.an identification number different from other extinguishers on the unit
A.the pump discharge
B.the manifold connection
C.each fire station discharge
D.the pump station
A.American Petroleum Institute
B.National Standard Fire hose Coupling
C.American Society of Mechanical Engineers
D.Underwriter's Laboratories，Inc
A.week
B.two weeks
C.month
D.two months
A.easy access to its storage compartment
B.replacement of the battery without exposure to the weather
C.it to float free if the unit sinks
D.it to remain attached to the unit
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During the manufacture of line，yarns are twisted together in the（）.
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