短語(yǔ)詞組短語(yǔ)speed -up and -down control 加減速控制speed d down 減速nominal speed of down motion 下行額定速度Speed -up -down 加減速control in speed -up & speed-down 升降速控制Speed up and down 上下速度Speed Down Switch Failure 減速開(kāi)關(guān)失效 返回 speed down