小径管射线透照一般都要求椭圆透照，由于透照截面厚度变化大，透照情况比较特殊。
The irradiating method of small caliber cube radial needs elliptical irradiating, because the irradiating section's thickness has big change, irradiating situation is especial.
所以这就是股骨的长度,这是它的厚度,这是它的横截面积。
So this will be the length of the femur d and this will be the thickness, d A and this will be the cross-sectional area A.
当占空比为10%时，得到最大的氧化膜厚度和最佳的氧化膜截面形貌。
The oxide film formed at the duty cycle of 10% has a maximum thickness and best section morphology.
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