单项选择题
A preson who sees someone fall overboard should（）.
A.call for help and keep the individual in sight
B.run to the radio room to send an emergency message
C.immediately jump in the water to assist the individual
D.go to the bridge for the
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单项选择题
A portable dry chemical fire extinguisher discharges by（）.
A.gravity when the extinguisher is turned upside down
B.pressure from a small CO2 cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical -
单项选择题
A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.
A.generators
B.oil drums
C.the bridge
D.combustible metals -
单项选择题
A position obtained by applying only your vessel’s coures and speed to a known position is a（）.
A.dead-reckoning position
B.fix B.estimated position
C.probable position
D.running fix
