单选题

Calibrated Airspeed (CAS)is to be used only as necessary to comply with any applicable requirements of the certificating authority as the pilot works exclusively with Indicated Airspeed (IAS).

AA. 修正空速(CAS)仅为按需使用，以符合认证机构的任何对应要求，因为飞行员延程飞行时需按照指示空速(IAS)工作。

BB. 修正空速(CAS)仅在紧急情况时使用，以符合认证机构的任何对应要求，因为飞行员不能按照指示空速(IAS)工作。

CC. 修正空速(CAS)仅在必要时使用，以符合认证机构的任何対应要求，因为飞行员完全按照指示空速(IAS)工作。

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正确答案：A （备注：此答案有误）

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