The artical introduce in detail manufacture test of nickel base and heat-resistant alloy blade with fir-tree root and manufacture method of strong grinding in slow advance.
To solve problems of slow advance rate and inconsistency in driving in hydromining area of Junde Coal Mine of Hegang Mining Administration, in view of coal seams condition and pattern of rock pressure manifestation, during mining in south part of No. 21 coal seam, the trapezium-shaped timber set support is changed into single-side pointed prop support to achieve the goals of improving unit output of hydraulic mining and better economic benefit have been gained.
Aiming at the problems of big difficulty pore-forming and slow advance of construction,it represents the problems should be take care in design and the corresponding steps,and puts forward the advice for the design alternate of pile foundation,after the calculation and analysis then decide a design program in the end,to assure the quality of bridge foundation.
The slow advance in quantitative characterization of molecular attributes is primarily due to lack of precise definition of such attributes.
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On the other hand, in the case of a slow advance of the reaction there is increased post-irradiation polymerization.
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Lack of dissemination of information has been much of the problem behind the comparatively slow advance in fire investigation.
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At present, the major factors to restrict the development of our agriculture are: the irrational devel- opment of industry and city; the sluggish on circulation and processing of agricultural protection, the irrational price-system of agricultural product, the lower agricultural product structure, the backward of infrastructure on a- griculture, the slow advance of agricultural technology and the underdeveloped agriculture information.These issues should be solved completely systematically and s...
The artical introduce in detail manufacture test of nickel base and heat-resistant alloy blade with fir-tree root and manufacture method of strong grinding in slow advance.
To solve problems of slow advance rate and inconsistency in driving in hydromining area of Junde Coal Mine of Hegang Mining Administration, in view of coal seams condition and pattern of rock pressure manifestation, during mining in south part of No. 21 coal seam, the trapezium-shaped timber set support is changed into single-side pointed prop support to achieve the goals of improving unit output of hydraulic mining and better economic benefit have been gained.