| 单词 | ifr |
| 释义 | > as lemmasI.F.R. I.F.R. n. Instrument Flight Rules. Π 1948 Jrnl. Royal Aeronaut. Soc. 52 90/1 The biggest factor affecting reliable running is the time difference between operations under clear and low visibility conditions, C.F.R. (Contact Flight Rules) and I.F.R. (Instrument Flight Rules) as they are called. 1964 Times Rev. Industry Apr. 40/3 Under IFR, electronic navigation equipment defines the position, and facilitates landing in bad weather or at night. < as lemmas |
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