求助:在API 610 5.6.15中:The rotor of one and tow stage pumps shal be designed so its first dry-bending critical speed is at least 20% above the pumps's maximum continous operating . * i7 G# X$ F7 a/ o# A
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其中 first dry-bending critical speed 是指啥意思。. o% \4 i7 @) p- l