圣安德鲁斯在相反方向的10英里处。
两个脉冲发送转(在相反方向):一个脉搏每180度。
TWO pulses sent by turn (in opposite direction) : One pulse each 180 degrees.
同样原因,较大的平坦表面应稍拱起以避免在相反方向凹下。
For this reason, any large, flat areas should be crowned convex to prevent dishing in the reverse direction.
you're looking for that equal and opposite forces acting at two ends of the rope.
你就得求出作用在绳子两端的,大小相等方向相反的力
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