two or more impellers housed together in one casing and mounted on a single shaft
a single stepped impeller mounted in a progressively staged casing
a large radial clearance between the impeller and casing to prevent overheating due to
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
第1题：
A. Mirroring with striping
B. Striping with dedicated parity
C. Striping with distributed parity
D. Independent disks with shared parity
第2题：
Which of the following is BEST described as a storage system that can be connected to multiple servers through a fiber channel?（）
第3题：
The author's friend can best be described as______.
A. selfish
B. patient
C. tactful
D. sympathetic
33．答案为C 通过文章的讲述，可知女孩处理事情的方式很周到得体，因此选C。
第4题：
one size larger than the pump discharge nozzle
the same size as the pump discharge nozzle
one size smaller than the pump discharge nozzle
installed with a short radius elbow at the pump
第5题：
the mechanical seal
packed stuffing boxes
either A or B
neither A nor B
第6题：
All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．
A.Set the relief valve
B.Check the lubrication system
C.Vent the pump casing
D.Open the pump suction and discharge valves
第7题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第8题：
Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.
A.suction
B.exhaust
C.pressure
D.discharge
第9题：
sullenness at defeat
reconciliation with the broadcasters
righteous indignation
determination to prevail
第10题：
Angry and subjective
Calm and objective
Analytic and ambivalent
Grim and self-satisfied
Tentative and biased