In general can be twist drill hole, but you should drill holes, step and then expanded to the required diameter.
用一般的麻花钻即可开孔，但应先钻小孔，然后步扩大到所需直径。
Methods: Prepared the monodisperse and big diameter crosslinked polystyrene microspheres with Two Step Swelling Method, Using diVinylbenzene as the crosslink agent.
方法：以苯乙烯为单体，二乙烯苯为交联剂，采用二步溶胀法合成单分散、大粒径的聚苯乙烯高分子微球。
Measurement of vascular centerline and diameter is a fundamental step in diagnosing vascular diseases and planning minimally invasive surgery.
血管中心线及直径的测量是血管类疾病诊断和微创介入治疗的重要依据。
Upper step wedge and lower pass-line adjustment unit serve to compensate wear of WR diameter and BUR diameter.
上阶梯垫装置和下轧制线调整装置是补偿工作辊和支撑辊直径磨损减小的装置。
The effects of stitching technical parameters such as the stitch thread diameter, stitch step and stitch space on the stitched composite laminates are also analyzed.
研究了缝纫参数(包括缝纫线直径，缝纫针距和行距)对缝纫复合材料层合板屈曲强度的影响。
After modified design, the M-827 measuring rule used to measure step diameter can measure the actual dimension deviation of machined parts directly and quality of the parts is improved too.
改进设计的M—827止口直径测量尺能够直接测量出被加工零件的实际加工尺寸偏差，提高零件加工质量。
The mill I use for this step is 2 mm in diameter.
轧机我使用的这一步是2毫米，直径。
The large size diameter of step roller operates minimizes the noise and prolongs the product life.
大直径的梯级滚轮，运行平稳，噪音更小，寿命加长。
It can calculate the torsion rigidity of the variable section step-shaft simply using the general formula for calculating the same diameter shaft which can be found directly in material mechanics.
从而可利用材料力学中求解等直径圆轴扭转刚度的一般公式简便地求出变截面阶梯轴的扭转刚度。
With these step function models, the crown diameter growth of Eucalyptus clones can be predicted, and it also provided scientific basis for the reasonable management of Eucalyptus plantations.
利用已建立的阶跃函数模型可以有效地预测不同桉树品系人工林树冠生长动态，为桉树人工林的合理经营提供科学依据。
The need to create a large dome (1500 m in diameter and a height of 350 meters) was the first step in order to create a microclimate that can respond to the climatic problem Astana.
创建一个直径1500米高度350米的大圆顶是该项目的第一步，如此一来，就会创建出一个小气候，为阿斯塔纳的气候问题做出回应。
Thee mill (purple) I use for this step is 2 mm in diameter.
轧机（紫色）我使用的这一步是2毫米，直径。
Thee mill (purple) I use for this step is 2 mm in diameter.
轧机（紫色）我使用的这一步是2毫米，直径。
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