随着各民族长期不断地迁徙、同化和融合，至清末，新疆才确立了以维吾尔族为主体，有汉、哈萨克、蒙古、回等（）个民族共同聚居的局面。
查看答案
影响刮板输送机输送能力的因素是（）。
A. 采煤机牵引速度
B. 采高
C. 截深
D. 装满系数
A wire rope that has been overstrained will show（）.
A. a bulge in the wire where the strain occurred
B. a decrease in diameter where the strain occurred
C. a kink in the wire where the strain occurred
D. no visible effects of an overstrai
微信支付 
支付宝支付