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单选题
外界大气温度是指自由空气的静态温度，可从飞机上的温度指示或地面气象源获得，并根据仪器误差和压缩性效应进行调整。
A
Outside air temperature is the free air static temperature, obtained either from temperature indications onboard or ground meteorological sources, adjusted for instrument error and compressibility effects.
B
Outside air temperature is the free air static temperature, acquired either from inflight temperature indications or ground geological sources, modified by instrument error and compression effects.
C
Outside air temperature is the free air static temperature, derived either from inflight temperature indicators or ground methodological sources, modulating instrument error and compressibility effects.
答案解析
正确答案：A
相关知识点：
外界气温指自由空气静温
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