问题描述：
英语翻译
1.Acceptable for high-performance,precision-engineered applications only where reasonable efforts have been made to ascertain that other alternatives are not technically feasible due to performance or safety requirements.
2.The principal environmental characteristic of concern for PFCs is that they have long atmospheric lifetimes and high global warming potentials.
3.Users must observe this limitation on PFC acceptability by conducting a reasonable evaluation of other substitutes to determine that PFC use is necessary to meet performance or safety requirements.
1.Acceptable for high-performance,precision-engineered applications only where reasonable efforts have been made to ascertain that other alternatives are not technically feasible due to performance or safety requirements.
2.The principal environmental characteristic of concern for PFCs is that they have long atmospheric lifetimes and high global warming potentials.
3.Users must observe this limitation on PFC acceptability by conducting a reasonable evaluation of other substitutes to determine that PFC use is necessary to meet performance or safety requirements.
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