Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.<br>A:Orsat apparatus<br>B:flame safety lamp<br>C:Halide torch<br>D:combustible gas indicator

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

出自：海船船员证

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