单选题The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）AdozensBparcelsCbundlesDgallons
单选题
The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A
dozens
B
parcels
C
bundles
D
gallons
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