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【简答题】
请用三菱 PLC 实现皮带运输机控制系统的要求。具体控制的要求如下: 1. 启动:启动时为了避免在前段运输皮带上造成物料堆积,要求逆物料流动方向按一定时间间隔顺序启动。其启动顺序为: 2. 停止:停止时为了使运输皮带上不残留物料,要求顺物料流动方向按一定时间间隔顺序停止。其停止顺序为:
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相关题目：
【单选题】Paul: Mary and Jill are both friends of mine ________ work for a non-profit. I can introduce you. Jake: Thank you!
A.
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B.
that’s
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