¿Cuál de las siguientes no es una densidad de plancha de lana mineral que suele usarse?

a. 1 libra (453 g)
b. 4 libras (1,81 kg)
c. 8 libras (3,63 kg)
d. 10 libras (4,54 kg)


a. 1 libra (453 g)

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