1. Menstruation became late 10 days, went to a hospital yesterday urinalysis is electronegative. Am I pregnant? �¾�����10�죬����ȥҽԺ���������ԡ����Dz��ǻ����˰���
2. Antigen of second liver surface why is somebody electropositive somebody be electronegative? Which had been planted? �Ҹα��濹ԭΪʲô��������������������?���ֺ���?
3. A chemical bond in which a hydrogen atom of one molecule is attracted to an electronegative atom, especially a nitrogen, oxygen, or fluorine atom, usually of another molecule. һ�����ӵ���ԭ����һ���������ԭ����������һ�ֻ�ѧ����������һ����ԭ�ӣ���ԭ�ӣ����ԭ��ͨ��������һ�����ӵ�ԭ����������