單項(xiàng)選擇題

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

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單項(xiàng)選擇題

When securing a flash-type evaporator for an extended period of time, you should （）.

A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air

單項(xiàng)選擇題

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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Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）

你可能感興趣的試題

When securing a flash-type evaporator for an extended period of time, you should （）.

A distinguishing feature of an educator, when compared to other pumps, is the （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精