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【单选题】
A multistage centrifugal pump can be BEST described as having _____.A.
two or more impellers housed together in one casing and mounted on a single shaft
B.
a single stepped impeller mounted in a progressively staged casing
C.
a large radial clearance between the impeller and casing to prevent overheating due to
D.
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
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A.
You are right
B.
I think so
C.
No,thanks
D.
You're welcome
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A.
so
B.
that
C.
not
D.
to
【简答题】我国工频交流电的频率是____Hz.
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