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最佳答案:it's very hot!(Come)an ice cream?
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最佳答案:1.shaft轴2.block滑车;滑轮组3.collar环;轴环4.levering plate杠杆垫板5.guide rail 导轨6.Linear Bal
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最佳答案:Everyone,in the anicent Ming dynasty,when there were no electricity or steam to
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最佳答案:1.Take a notebook next time.2.Are you living alone,how about joining us?3.When h