工件上某一被测要素的坐标误差有可能是数控系统的坐标定位精度不够造成的,一般数控系统都有各坐标轴的()功能,这个功能是将滚珠丝杠由于制造原因造成的螺距误差用参数设定的方法分段进行补偿,以提高坐标定位精度,如果这项工作没有进行,会直接影响坐标定位精度。
A. 三轴联动
B. 绝对坐标定位
C. 进给速度修调
D. 螺距误差补偿
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11. public static void main(String[] args) { 12. Integer i = uew Integer(1) + new Integer(2); 13. switch(i) { 14. case 3: System.out.println(”three”); break; 15. default: System.out.println(”other”); break; 16. } 17. } What is the result?()
A. three
B. other
C. An exception is thrown at runtime.
D. Compilation fails because of an error on line 12.
E. Compilation fails because of an error on line 13.
F. Compilation fails because of an error on line 15.
王家岭矿“3•28”特别重大透水事故有关资料:经初步调查分析,王家岭矿建设施工中存在着严重的违规违章行为。该矿井下施工的20101工作面回风巷掘进期间导通老空区积水,致使+583米标高以下的巷道被淹,造成38人死亡。1、指出这起事故的违章行为?2、谈谈对这起事故的看法。
One of the causes of ocean currents is density differences in the water. This is true because ().
A. in an area of high density the water's surface is lower than in an area of low density
B. surface water flows from an area of high density to one of low density
C. the lesser the density gradient the freer the water is to move
D. it is the density differences that cause the currents to stay in the trough
小班幼儿喜欢不同的玩具,因此,小班的玩具品种应多样,同种玩具店额数量尽量少点。
A. 正确
B. 错误