短語詞組短語crank k web 曲柄臂crank web deflection 臂距差;曲臂撓度;臂撓度crank web cooling 曲柄臂冷卻thickness of crank web 曲柄臂厚度crank with circular web 曲柄圓磐oblique crank web 斜曲柄straight crank web 直曲柄板 返回 crank web