tell us briefly about the working principles of the purifier ,the oil water seperator and air compressor .
tell us briefly about the working principles of the purifier ,the oil water seperator and air compressor .
相关考题：
Could you ____ me how to ________ this word in English? (A. tell, speakB. speak, sayC. tell, sayD. say, speak
Conceptual categories called notions are the______of organization, sequenced by some sense of chronology or usefulness of each notion. A.aimB.planC.basisD.principles
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