Shape Oblate Type 果形扁圆型
Pipe end its shape is divided into tube, square tube, rectangular tube, oblate tube, P-shaped pipe, rectangular pipe.
钢管因其端部外形又分成圆管、方管、矩形管、扁圆管、P形管、异型管。
Because of its oblate shape, the moment of inertia of the earth is a maximum about the polar axis and minimum about an axis in the equatorial plane.
由于地球是扁球体，绕极轴惯量矩最大，而绕在赤道面内的轴的惯量矩最。
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