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一、填空 , 1.在射击时,瞄准的要领是“三点一线”,这是利用——的原理,光在——的速度最大,为——米/秒
First, fill in the blanks, 1. During shooting, the aiming point is “three points and one line.” This is the principle of using - and the speed of light - is the maximum, and is - m/s.