change-over radius
... change-over plug 转换插塞，换路插头 change-over radius 过渡区半径 change-over relay 切换继电器 ...
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燃烧室膜片的形状是这样的，使过渡区的最小曲率半径小于底部段的最小曲率半径。
The shape of the membrane is such that the smallest radius of curvature of the transition zone is smaller than the smallest radius of curvature of the base section.
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