发布时间:2025-01-31 03:46:52
颈椎病在坐姿上应保持自然的端坐位,臀部和背部要充分接触椅面,双肩后展,两肩连线与桌沿平行,脊柱正直,两足着地。民间的高手,高手中的高手!在科技一路上。
用15kw的变频器拖动185kw的电机有时会出现过热能不能通过改变传动比提高变频器的频率
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