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20的工字钢一米多重_家居日记
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20的工字钢一米多重

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20的工字钢一米多重 有a、b两种型号，前者一米重27.9公斤，后者重量为31.1公斤每米。它们的区别在于横截面积不同，a型面积为35.5平方厘米，b型为39.


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