18x18的精选

20米&nbsp&nbsp&nbsp&nbsp1．井道宽度：面对电梯厅门，测量井道两侧壁间的净空尺寸。井道进深：从厅门口内壁到井道后壁之间的净空尺寸。对井道的宽度和进深，每一层都要测量，防止井道上下偏差过大。用一根细长木竿由厅门洞口探...