常見例句雙語例句Cantilever beam of key strata breaks and caves into blocks, which is periodic weighting of mining face.關(guān)鍵層懸臂梁破斷垮落成承壓砌塊，其垮落及沿架後切落，形成工作麪周期來壓。The fracture of overlying key stratum results in decrease of the roof caving angle and the increase of periodic caving span and weighting intensity.覆巖關(guān)鍵層的破斷使工作麪頂板垮落角減小、周期垮落步距和來壓強(qiáng)度都增大。Periodic weighting was analysed by the bearing wedge model, simultaneity, the mechanics of first weighting and periodic weighting were expounded.利用承壓砌塊模型分析了周期來壓過程，竝給出了初次來壓和周期來壓機(jī)理。 返回 periodic weighting