After door window is installed, appear directly tall the aperture of low, fan and casing is inhomogenous phenomenon, exist sometimes on wide below narrow or below wide on narrow issue.
英
美
释义
门窗安装后,出现一头高一头低、扇和框的缝隙不均匀现象,有时存在上宽下窄或下宽上窄的问题。
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