而且无需要担心空压机备用机问题，可以大大提高空压机的运行性能。
And no need to worry about air compressor spare machine problem, can greatly improve the performance of the compressor.
备用机场，当不可能或不适宜在预选机场着陆时，可作着陆使用的场机。
ALTERNATE aerodrome, an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or land at the aerodrome of intended landing.
备用机场，当不可能或不适宜在预选机场着陆时，可作着陆使用的场机。
ALTERNATE aerodrome, an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or land at the aerodrome of intended landing.
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