Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）<br>A:Close radial clearance between impeller hub and casing<br>B:Low rotational speed of impeller<br>C:Removable end plate<br>D:Replaceable impeller and casing wearing rings

Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）
A:Close radial clearance between impeller hub and casing
B:Low rotational speed of impeller
C:Removable end plate
D:Replaceable impeller and casing wearing rings

出自：海船船员证

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