A distinguishing feature of an educator, when compared to other pumps, is the （）.<br>A:dischargeendbeingsmallerthanthesuctionend<br>B:smallsizeofimpeller<br>C:lackofmovingparts<br>D:easeatwhichthewearingringsmaybechanged

A distinguishing feature of an educator, when compared to other pumps, is the （）.
A:dischargeendbeingsmallerthanthesuctionend
B:smallsizeofimpeller
C:lackofmovingparts
D:easeatwhichthewearingringsmaybechanged

出自：海船船员证

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