单选题Air receivers installed in starting air systems are to be （）.Acylindrical in shape with service connections located at the top and bottomBopened and made available for inspection during biannual inspections providedCwith automatic drain traps for the removal of moistureDso installed as to make the drain connections effective under extreme conditions of trim
单选题
Air receivers installed in starting air systems are to be （）.
A
cylindrical in shape with service connections located at the top and bottom
B
opened and made available for inspection during biannual inspections provided
C
with automatic drain traps for the removal of moisture
D
so installed as to make the drain connections effective under extreme conditions of trim
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