A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: ">实体</span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: ">实体键</span><span lang="EN-US" style="FONT-SIZE: 14pt"></span><p></p><p></p>
C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: ">属性</span><span lang="EN-US" style="FONT-SIZE: 14pt"></span><p></p><p></p>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: ">关系</span><span lang="EN-US" style="FONT-SIZE: 14pt"></span><p></p><p></p>