A.12.5% B.16.5% C.19.5% D.23.5%
A.0.1% B.0.2% C.0.5% D.1%
A.有進(jìn)設(shè)備作業(yè)許可證 B.設(shè)備里有監(jiān)護(hù)人 C.有救護(hù)器具 D.氧含量及有機(jī)物含量合格