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最佳答案:With the excessive consumption of energy, our living environment is becoming wor
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最佳答案:减速机采用油浴式润滑,其油面高度按示油位控制,不宜过多或过少.初次使用24小时左右,必须将润滑油放掉,用轻油(柴油或煤油)冲洗干净,然后重新加入新的润滑油,以后
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最佳答案:The main lesson today about how to write a news summary. The farmer took 20 year