单选题While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.Aenter the tank safelyBsuspect the accuracy of the readingCventilate the tankDtest for nitrogen
单选题
While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.
A
enter the tank safely
B
suspect the accuracy of the reading
C
ventilate the tank
D
test for nitrogen
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