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牛和斤不能換算,它們不是相同的物理量 重一牛的物體質量為0.1公斤,而一公斤等於二斤,所以應為0.2斤
一公斤等於一千克,而一千克等於9.8牛,所以一牛等於1/9.8千克也就是0.1020408. 200牛自然就是200/0.0098克了{20408.163265306.}.
1牛是50g =0.05KG
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