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单选题
If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）
A
Replace the batteries
B
Check the sampling tube for blockage
C
Adjust the final reading by the amount the needle is displaced from zero
D
Replace the platinum filament
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单选题When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
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考题
单选题A combustible gas indicator meter is calibrated to read the percentage of（）.A
vapor to oxygenB
the flammable limit concentrationC
the autoignition concentrationD
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if there is sufficient oxygen to support lifeB
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单选题When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
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考题
单选题An oxygen indicator will detect （）.A
the amount of oxygen in a spaceB
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concentrations of explosive gasD
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考题
单选题After each reading of an oxygen indicator，the instrument should be purged with（）.A
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考题
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combustible gas indicatorC
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oxygen indicator
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