On a class “B” fire，which portable fir

1、All portable fire extinguishers must b

All portable fire extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class "B" fire

2、The class of fire on which a blanketin

The class of fire on which a blanketing effect is essential to extinguish the fire is （）.Aclass ABclass BCclass CDclass D

3、When fighting a fire with a portable d

When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.Aover the top of the flamesBoff a bulkhead into the fireCin front of the fireDat the base of the fire

4、Which portable fire extinguisher shoul

Which portable fire extinguisher should be used on a class C fire on board a vessel?（）ACarbon dioxideBWater (stored pressure)CFoamDCarbon tetrachloride

5、Which types of portable fire extinguis

Which types of portable fire extinguishers are designed for use on electrical fires?（）ADry chemical and carbon dioxideBFoam (stored pressure) and soda-acidCCarbon dioxide and foam (stored pressure)DDry chemical and soda-acid

6、All portable fire extinguishers must b

All portable fire extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class 'B' fire