单选题Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.AOrsat apparatusBflame safety lampCHalide torchDcombustible gas indicator
单选题
Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.
A
Orsat apparatus
B
flame safety lamp
C
Halide torch
D
combustible gas indicator
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