铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,890g铜丝和270g铝丝的长度之比为4:1,若铜丝的直径是2mm,则铝丝的直径是 A 0.5mm B 1mm,C 4mm,D 8mm
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![铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,890g铜丝和270g铝丝的长度之比为4:1,若铜丝的直径是2mm,则铝丝的直径是 A 0.5mm B 1mm,C 4mm,D 8mm](/uploads/image/z/777815-71-5.jpg?t=%E9%93%9C%E7%9A%84%E5%AF%86%E5%BA%A6%E6%98%AF8.9g%2Fcm%26sup3%3B%2C%E9%93%9D%E7%9A%84%E5%AF%86%E5%BA%A6%E6%98%AF2.7g%2Fcm%26sup3%3B%2C890g%E9%93%9C%E4%B8%9D%E5%92%8C270g%E9%93%9D%E4%B8%9D%E7%9A%84%E9%95%BF%E5%BA%A6%E4%B9%8B%E6%AF%94%E4%B8%BA4%EF%BC%9A1%2C%E8%8B%A5%E9%93%9C%E4%B8%9D%E7%9A%84%E7%9B%B4%E5%BE%84%E6%98%AF2mm%2C%E5%88%99%E9%93%9D%E4%B8%9D%E7%9A%84%E7%9B%B4%E5%BE%84%E6%98%AF+A+0.5mm+B+1mm%2CC+4mm%2CD+8mm)
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铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,890g铜丝和270g铝丝的长度之比为4:1,若铜丝的直径是2mm,则铝丝的直径是 A 0.5mm B 1mm,C 4mm,D 8mm
铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,890g铜丝和270g铝丝的长度之比为4:1,若铜丝的直径是2mm,则铝丝的直径是 A 0.5mm B 1mm,C 4mm,D 8mm
铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,890g铜丝和270g铝丝的长度之比为4:1,若铜丝的直径是2mm,则铝丝的直径是 A 0.5mm B 1mm,C 4mm,D 8mm
答案C
铜的密度是8.9g/cm³,铝的密度是2.7g/cm³,则890g铜丝和270g铝丝的体积相等;铜丝和铝丝的长度之比为4:1,得截面积之比为1:4,可得截面直径之比为1:2(1:4开平方)
选c
A
C