问题
单项选择题
Deficient oxygen content inside a chain locker can be detected with（）.
A.litmus paper
B.combustible gas indicator
C.oxygen breathing apparatus
D.oxygen indicator
答案
参考答案：D
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Deficient oxygen content inside a chain locker can be detected with（）.
A.litmus paper
B.combustible gas indicator
C.oxygen breathing apparatus
D.oxygen indicator
参考答案：D