It is important to remember that an inerted atmosphere may become flammable again if air is admitted ___________.(1.0)
A.during routine measuring B.on venting the mixture to atmosphere C.during gas freeing with air D.all of the above正确答案D
It is important to remember that an inerted atmosphere may become flammable again if air is admitted ___________.(1.0)
A.during routine measuring B.on venting the mixture to atmosphere C.during gas freeing with air D.all of the above正确答案D
