实现控制生产机械运动部件的行程，使其在一定范围内自动往返循环，主要依靠（）。
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Which definition best describes the staging plan development service component within the design phase？ Select exactly 1 answer（s） from the following：（）。
A. providing a step-by-step plan that details the installation and service-commission tasks required in order to create a controlled-implementation environment that emulates a customer network
B. assessing the ability of site facilities to accommodate proposed infrastructure changes
C. developing and executing proof-of-concept tests， validating high-level infrastructure design， and identifying any design enhancements
D. improving the network management system and the performance and functionality of infrastructure operatio
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A. 正确
B. 错误
（）表示英制输入的指令。
A. M90
B. G01
C. G20
D. G91
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