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