1. Polyvalent Metal Hydroxyl Complexes. ��۽����ǻ�����
2. A new calculating model was derived from the relation of absolute hardness to the radii of polyvalent ions. �Ӿ���Ӳ�������Ӱ뾶�Ĺ�ϵ����һ�������ӵ������ܵļ���ģ�͡�
3. Major treatment methods for arsenic include sulfide precipitation, or complexation with polyvalent heavy metals. �����Ҫ����������������������������ؽ�����ϡ�
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adj.
1. containing several antibodies each capable of counteracting a specific antigen
2. having more than one valence, or having a valence of 3 or higher