If you run this markup, no error message will appear: The for-each loop simply won't execute. 如果您运行此标记,不会出现任务错误消息:for-each循环根本不会执行。
Stepping motor, with it's convenience of connecting with computer, no error accumulation of output angle displacement, high precision in open loop, is becoming the important execute component. 由于其系统与计算机接口特别方便,输出角位移误差不会长期积累,开环运行有较高的精度,因而成为数控系统中的重要执行部件。