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耐火等级 nàihuǒ děngjí
hydroel.st.	fire resistance classification
nucl.pow.	fire rating
oil	fire endurance rati ng; fire resistance rating
tech.	fire endurance rating; fire grading; fire-protection rating; fire-resistance class; fire-resistant rating; fire-resistive rating (测定); fire-retardant rating (测定); degree of fireproof
结构件的耐火等级 nàihuǒ děngjí
tech.	fire-resistance grading

耐火等级: 10 phrases in 3 subjects

Hydroelectric power stations	2
Polymers	1
Technology	7