The two factors which make underwater hull repair difficult are accessibility and the（）.

单项选择题The required fireman’s outfits required for ship’s are not to be used for any other purpose EXCEPT for the（）.

A.oxygen and explosion meter when it is used for detection of flare gases
B.self-contained breathing apparatus，when used as protection from gas leaking from a refrigeration unit
C.boots and gloves that are made of rubber or electrically non-conductive material，if used when repairing electrical equipment
D.lifeline，if used by personnel entering a compartment which might be deficient of oxygen

单项选择题The radio technician will come aboard（）the repairs.

A.on
B.in
C.with
D.for

单项选择题The order of importance in addressing damage control is（）.

A.control flooding，control fire，repair structural damage
B.restore vital services，control fire，control flooding
C.control fire，restore vital services，control flooding
D.control fire，control flooding，repair structural damage

单项选择题The notice of casualty to a vessel must include（）.

A.a request for assistance
B.the location of the unit at the time of the casualty
C.an estimate of the cost to repair damages
D.the amount of fuel remaining

单项选择题The Loran needs（）.

A.repairing
B.to repair
C.repairs
D.have repaired