There are considerable pulsating stresses between the hub and rib plate of rotor spider in bulb hydrogenerator.So some defects such as cracks would occur during long-time operation of the unit.是什么意思_There are considerable pulsating stresses between the hub and rib plate of rotor spider in bulb hydrogenerator.So some defects such as cracks would occur during long-time operation of the unit.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句