潜水艇是靠改变自身重力来实现浮沉的潜水艇在国防中起着重要的作用现有一艘潜艇其漂浮是受到的浮力为9×106n.求1该潜艇的质量.2当 Template




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tomski潜水艇是靠改变自身重力来实现浮沉的潜水艇在国防中起着重要的作用现有一艘潜艇其漂浮是受到的浮力为9×106n.求1该潜艇的质量.2当 coloring