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That cone Angle is directly controlled by the focal length.
圆锥角度直接受到焦距的控制。
youdao
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The half-cone-angle has little effect on the oscillation frequency of thrust.
半锥顶角对推力波动特性影响很小。
youdao
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The half-cone-angle has little effect on the oscillation frequency of thrust.
半锥顶角对推力波动特性影响很小。
youdao