A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.<br>A:purifies<br>B:combinations<br>C:concentrations<br>D:filters

A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.
A:purifies
B:combinations
C:concentrations
D:filters

出自：海船船员证

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