" When emergency entry is made into a space which is known to be deficient in oxygen should be used.
A.fireman’s outfits
B.breathing apparatus
C.gas masks
D.canisters
正确答案是B
" When emergency entry is made into a space which is known to be deficient in oxygen should be used.
A.fireman’s outfits
B.breathing apparatus
C.gas masks
D.canisters
正确答案是B