To obtain maximum efficiency, two stage air compressors are usually （）.<br>A:horizontally mounted<br>B:never fitted with intake filters<br>C:fitted with intercoolers<br>D:operated in an unloaded condition at all times

To obtain maximum efficiency, two stage air compressors are usually （）.
A:horizontally mounted
B:never fitted with intake filters
C:fitted with intercoolers
D:operated in an unloaded condition at all times

出自：海船船员证

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