圆的对称中心线就是直径。
手柄并不是关于中心线对称。表中的尺寸表示最大操作半径。
Handle is not symmetrical about stem centerline. Dimension shown represents the longest operational radius.
水平地基的变形大致对称于线路中心线，斜坡地基的变形集中在下坡一侧边坡下；
The deformation of level foundation is generally symmetric of road central line and the deformation of slope foundation is mainly concentrated on the border side of the declivity.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
优选的，所述壳体的表面流线型由头部到尾部逐渐收缩，所述后开口围绕所述壳体的中心线对称分布。
Preferably, the streamline surface of the shell is gradually shrunk from the head to the tail, and the rear openings are symmetrically distributed around the Central Line of the shell.
优选的，所述壳体的表面流线型由头部到尾部逐渐收缩，所述后开口围绕所述壳体的中心线对称分布。
Preferably, the streamline surface of the shell is gradually shrunk from the head to the tail, and the rear openings are symmetrically distributed around the Central Line of the shell.
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