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