查询词典 soft iron core

Drilling a hole in the coal seam, soft rock and in the farmland beat the well time and limited efficacy rate .

200米液压钻机主要用于钻探各种深度为200米左右的各种角度的各类用途的孔，可在不同硬度的岩石中钻孔，而在煤层、软岩石中钻孔以及在农田打井时效率最高。

Grouting reinforcement construction technology for the soft rock of coal bin ;2. The geologic conditions of coal bin and selection conditions of coal bin support are introduced.

介绍了煤仓的地质条件、煤仓下口支护方案的选择条件及煤仓仓身的施工过程，详细阐述了锚杆支护设计参数的选择过

To the soft coal, there are once crack density increment and once crack expansion, and the expansion is import to fracture. It is found that the relation between the fractal dimension of crack and the abutment pressure is polynomial expression.

研究表明，裂隙分维和支承压力具有良好的多项式定量关系；同时，通过顶煤压裂试验得出了基于损伤力学的顶煤压裂本构方程，损伤变量的变化验证了裂隙演化规律的正确性。

The selection principle of the roof control parmeters is introduced at the blasting caving coal face in three soft coal seam.

介绍了三软不稳定煤层炮采放顶煤工作面顶板控制参数的选择原则。

The bolting support principle is introduced to support roadways in extremely soft seam of coal mine with complex roof.

复合顶板极软煤层巷道是围岩变形剧烈且顶板易冒落极难维护的巷道。

The time to produce damage deformation in surrounding rock and possible loosening area are obtained by analyzing in situ measurement of displacement in soft weak coal layer.

本文通过对软弱煤层巷道进行位移实测及数据分析，得到了西部某矿软弱煤层巷道围岩变形达破坏所需的时间和可能的变形松动区域。

A soft, brownish-black coal in which the alteration of vegetable matter has proceeded further than in peat but not as far as in bituminous coal .

褐煤一种褐色软质煤，植物性物质的变化程度比泥煤重但比烟煤轻

At this time, I added a shovel of soft coal, and like being conjured, a stream of black smoking rose, at once was absorbed by the smoking path.

这时候，我加上一铁锹煤，炉子里像施了魔法一般，腾起一股黑烟，但即刻被烟道吸了进去。

Fears that the euro would be a "soft" currency have proved unfounded.

欧元将会是个软通货的担忧是毫无根据的。

Soft currency: Currency that is subject to sharp fluctuations in value.

软币，软通货：币值变化较大的货币。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48