Any extinguishing agent used on a Clas

1、An obstruction on a helodeck is any ob

An obstruction on a helodeck is any object that might present a hazard to the（）.Arotor blades and landing gearBunloading of passengersCloading of cargoDpilot's visibility

2、After using a Halon extinguisher，it sh

After using a Halon extinguisher，it should be（）.Aput back in service if more than 50% of the charge remainsBrepaintedCdiscardedDrecharged

3、Halon from extinguishers used on a cla

Halon from extinguishers used on a class B fire，should be directed（）.Aat the top of the flamesBat the base of the fire near the edgeCin short quick burstsDtoward the upwind side of the fire

4、After using a C02 portable extinguishe

After using a C02 portable extinguisher,it should be（）.Aput back in service if some CO2 remainsBhydrostatically testedCretaggedDrecharged

5、A CO2 extinguisher on a ship which has

A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.Aused at the earliest opportunityBhydrotestedCrechargedDweighed again in one month

6、Fire extinguishers used on ship’s are

Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.Aused for electrical fires onlyBthe smallestCthe most accessibleDthe most effective