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单选题
An oxygen indicator will detect （）.
A
the amount of oxygen in a space
B
the presence of harmful amounts of carbon monoxide
C
concentrations of explosive gas
D
All of the above
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单选题An oxygen indicator will detect （）.A
the amount of oxygen in a spaceB
the presence of harmful amounts of carbon monoxideC
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All of the above
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单选题An oxygen indicator can be used to determine if there is（）.A
sufficient oxygen in a compartment to support lifeB
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All of the above
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litmus paperB
combustible gas indicatorC
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