矿山压力
参考答案:
地下的煤层和岩层,在未采动之前,处于应力平衡状态,采掘工程使其应力重新分布,在采掘空间周围岩体内形成一种促使围岩自己采掘空间运动的力
It is ___ the customers' needs that has made chain stores so popular in big cities in China. [ ]
A. meeting
B. met
C. to have met
D. being met
运动神经元病中最不易受累的肌肉是
A.四肢骨骼肌
B.躯十肌
C.呼吸肌
D.肛门括约肌
E.眼外肌