Exploration and development of coal-bed methane in China has its particularity for its geological conditions of coal-forming process and coalification are different from the US.
我国煤层气在成煤和煤化作用地质条件与美国有差异，勘探开发有一定特殊性。
The paper describes the building-up process of a large size rotary jet slip-casting pile by quick pore-forming in bulky iron slag layer and in river banks floated pebble bed.
阐述了在松散渣铁层及河岸漂卵石层中快速成孔，形成较大直径的旋喷注浆桩的过程。
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