The dc drives provide the answer to the most essential needs of acceleration , deceleration , stopping , and constant velocity , with inherent shaft stiffness for successful operation of the cnc system 直流電驅(qū)動(dòng)應(yīng)用自身固有的軸硬度成功地滿足了操作cnc時(shí),對(duì)最關(guān)鍵的加速度、減速、停止及常速度的需要。
Formulated by albert einstein in 1905 , relativity is built on the key idea that physical laws take the same form for any inertial observer ? that is , for an observer oriented in any direction and moving at any constant speed 愛因斯坦于1905年提出相對(duì)論,其關(guān)鍵思想在于,對(duì)任何慣性觀察者(朝任何方向、以任何恒常速度運(yùn)動(dòng)者)而言,物理定律的形式相同。