铱
铱是化学元素，符号为Ir，原子序为77，属于铂系过渡金属，为质地坚硬易碎个银白色固体。铱是所有元素中密度第二高个元素（仅次于锇），而渠个耐腐蚀性是所有金属元素中最高，勒2000℃高温下仍旧能抵抗腐蚀。
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