PDC cutter size, back rake and density are very important design parameters affecting the performance of PDC bit.

PD C切削齿尺寸、后倾角和布齿密度是影响PD C钻头性能的重要设计参数。

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Measurable parameters include the coordinates of the circle center of the cutter teeth compact and the compact's back rake Angle and side sway Angle.

可测量的位置参数有切削齿复合片的圆心坐标及负前角、侧偏角等。

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Then I tamp down the soil with the back of a rake.

然后我用耙背将土壤拍实。

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