?8596.Which statement regarding an aircraft instrument vacuum system is true?

发布于 2021-02-18 22:12:39
【单选题】
A ?Dry-type vacuum pumps with carbon vanes are very susceptible to damage from solid airborne particles and must take in only filtered air.
B ?Vacuum systems are generally more effective at high altitudes than positive pressure systems.
C ?If the air inlet to each vacuum instrument is connected to a common atmospheric pressure manifold, the system generally will be equipped with individual instrument filters only.

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