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埃勒因瓦恒弹性镍铁合金
met. Elinvar (33 ~ 35Ni, 53 ~ 61Fe, 4 ~ 5Cr, 1 ~ 3W, 0.5 ~2Mn,0.5~2Si,0.5~2C)
埃勒 因 瓦 合金
: 1 phrase in 1 subject
Chemistry1

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