單項(xiàng)選擇題After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell.What does this mean?（）.
A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak
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1.單項(xiàng)選擇題After using a C02 portable extinguisher,it should be（）.
A.put back in service if some CO2 remains
B.hydrostatically tested
C.retagged
D.recharged
2.單項(xiàng)選擇題All dunnage planks and mats must be sent to board（）commencement of loading.
A.prior to
B.during
C.in the period of
D.afterwards
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