词汇	necessary skill
释义	necessary skill 必需的技能
随便看	valve acceleration valve action valve action diode valve action system valve actuated pulse column valve actuating device valve actuating gear valve actuating mechanism valve-actuating mechanism valve actuating push rod valve actuating rocker valve actuation valve actuation member valve actuator valve actuator cable Valve actuators not correctly adjusted valve-acturated pulse column valve adapter valve adjust valve adjuster valve adjusting valve adjusting ball stud valve-adjusting means valve adjusting nut valve adjusting screw