扩孔

The results show that the surface microphotograph yielded in multiple-step machining with slow feeding and in one-step compound process is satisfactory, and there are fewer defects, lower deformation and thinner metamorphic layers; while that produced in other processes is quite rough, there are more defects and bigger deformation on the machined surface, and they are detrimental to assembly properties and fatigue life of fastening holes.

结果表明，钻扩铰多步慢进给工艺和一步复合制孔工艺所加工出的表面，平整、光滑、加工缺陷少、晶格变形小、变质层薄；而其它工艺条件下，孔表面微观形貌复杂、加工纹路紊乱、表面缺陷多、晶格畸变大，变质层厚，这些加工状况，对紧固孔的装配性能和疲劳寿命都有很大的影响。

The article discusses the law of ground temperature returning to freeze and the variation instance of upper bound on the basis of the cast-in-place pile s data which tested in place in permafrost regions.

结合对冻土区钻孔扩底桩的现场试验数据，论述了灌注桩地温的回冻规律及上限变化情况，通过现场静载试验，比较了扩底桩与直孔桩的抗拔能力，分析了桩周土体冻结强度、地面变化的基本状态。

The model test of drill auger boring into cement soil can easily and intuitively realize the optimization of the drill auger, and provide the basis for designing the optimized drill with least torque.

螺旋挤扩钻头钻进成孔模型试验可以方便、直观地定性实现螺旋挤扩钻头的初步优化工作，为选择所需成孔扭矩最小的最优短螺旋挤扩钻头提供设计依据。

After one time or few times springing blast, a few of detonators are used to extend calabashes; then main detonating charges are encased in it and blasted.

在主药包未装入炮孔之前，先用少量炸药经过一次或数次扩壶，将孔底扩大成葫芦形，然后再装入主药包进行爆破。

On this foundation the article inducts in detail the method which is based on the relative settlement of calculating unit area end support force at the same time considering the feature of pedestal pile"s "arch effect the article introduces conception of pile effective length and finally obtain the formula of calculating man-made pipe with bulb-shaped axial carrying capacity .

在此基础上论文详细归纳了以相对沉降为依据确定单位面积端承力q_b的计算方法，并考虑扩底桩的&拱效应&特点引入了有效桩长的概念，最后结合公路规范推出了比较实用的人工挖孔扩底桩轴向承载力计算公式。

None of the reamers in this position came closer than 20 mm to the nerve.

在这一位置上，没有1例扩孔钻与神经的距离在20mm以内。

None of the reamers in this position came closer than 20 mm to the nere.

在这一位置上，没有1例扩孔钻与神经的距离在20mm以内。

Other consumables such as bits, reamers, mud products and cement should also be stocked and inventory managed to avoid delays due to lack of materials.

其它此类消耗品，如钻头、扩孔器、泥浆产品和水泥也应有存货，而且库存管理要避免因材料缺失造成的延误。

Thrusted-expanded lime-soil compaction pile method thrusted-expanded a hammer and lime-soil compaction fill the integration of soil to achieve the purpose of the rule territories through the pile of soil compaction of the salt and lime-soil filling replacement, cementing sclerosis Such as the role of soil has been effective reinforcement.

柱锤冲扩灰土挤密桩法将柱锤冲扩成孔与灰土填料挤密相结合，实现了以土治土的目的，通过对桩周土体的挤密和灰土的冲填置换、胶凝硬化等作用使地基土体得到了有效的加固。

The effect of the number of jets and the pitch angle of jet on recovery coefficient of diffuser were analyzed, it is shown that the appropriate choice of parameters such as the number of jets and the pitch angle of jet can effectively control the flow separation in the diffuser.

文中还分析了不同射流孔数和射流倾斜角对于压力恢复系数的影响，发现选择合适的涡旋射流孔数及其射流倾斜角等参数，可以更有效的控制扩压器内流动分离。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。