单项选择题

Which item may be substituted for，in the fireman’s outfit，on a cargo vessel?（）

A.fire ax
B.flashlight
C.rigid helmet
D.flame safety lamp

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单项选择题
Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）

A.Water stream
B.Water fog or apray
C.Steam
D.Dry chemical
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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