单项选择题
For a ship not on an international voyage，an approved substitute for an impulse projected rocket-type line throwing appliance is a（）.
A.spring loaded line thrower
B.hand thrown buoyant line
C.shoulder-type line throwing gun
D.heaving line
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A.requested
B.allowed
C.approved
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An obstruction on a helideck is any object that might present a hazard to the（）.
A.rotor blades and landing gear
B.unloading of passengers
C.loading of cargo
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AN ILLNESS PREFERABLY OF AN INFECTIOUS NATURE SEIZING MORE THAN TWO PERSONS ON BOARD AT THE SAME TIME defines（）.
A.Disease of Crew
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