已知：生产的规格为1.2×1000mm，卷重为4.5吨，问该卷带钢的长度是多少？(镀锌板比重为7.6g/cm3)
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Resin-modifled GICs()
A. have a powder that is similar in composition to that of traditional GICs
B. release much more fluoride than traditional GICs
C. set only as a result of an acid-base reaction
D. exhibit less wear than composite resins
已知：生产的规格为1.0吨，问该卷带钢的长度是多少？(镀锌板比重为7.6g/cm3)
已知：生产的规格为0.25×1050mm，卷重为4吨，问该卷带钢的长度是多少？(镀锌板比重为7.6g/cm3)
已知：生产的规格为0.75×1050mm，卷重为5吨，问该卷带钢的长度是多少？(镀锌板比重为7.6g/cm3)
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