A. 采煤机牵引速度 B. 采高 C. 截深 D. 装满系数
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
A. 系统分析员 B. 信息主管 C. 负责人 D. 软件公司