单项选择题

When loading or discharging dry mud or cement，crew members should use goggles and（）.

A.facial respirator mask
B.ear plugs
C.rubberized boots
D.fireman's outfit

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单项选择题

When collecting condensation for drinking water，（）.

A.a sponge used to mop up and store condensation must be kept salt free
B.only condensation on the bottom of the canopy should be collected
C.it should be strained through a finely woven cloth
D.chlorine tablets should be used to make it drinkable

单项选择题

When choosing extinguishers to fight a Class “B” fire do NOT use（）.

A.carbon dioxide
B.dry chemical
C.foam (stored-pressure type)
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What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）

A.Sea anchor
B.Steering oar
C.Spare rudder
D.Daggerboard