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 . 2 a! P( l5 A9 d; k
1 h7 g+ @5 P! Z4 m/ `* t
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其中 first dry-bending critical speed 是指啥意思。 + G* I$ |1 |1 E4 p6 B) d. Z 6 w$ o* x/ q/ J% b& ? 谢谢