沿建筑物外墙四周及部分内墙的水平方向设置的连续闭合的梁称为（      ）

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<span style、"font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">散水</span>