Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.A.Orsat apparatusB.flame safety lampC.Halide torchD.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

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