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【多选题】
加层建筑物工程外墙脚手架工程量,以下计算 规则正确的是() : (1) 原有建筑物部分,按两个单排脚手架计算,其高度以原建筑物的外地坪至原有建筑物高度减2.5m。 (2) 加层建筑工程部分,按综合脚手架计算,其高度按加层建筑物的高度加2.5m,脚手架的定额步距按外地坪至加层建筑物外墙顶的高度。
A.
原有建筑物部分，按两个单排脚手架计算，其高度以原建筑物的外地坪至原有建筑物高度减2.5m。
B.
原有建筑物部分，按两个单排脚手架计算，其高度以原建筑物的外地坪至原有建筑物高度。
C.
加层建筑工程部分，按综合脚手架计算，其高度按加层建筑物的高度加2.5m，脚手架的定额步距按外地坪至加层建筑物外墙顶的高度。
D.
加层建筑工程部分，按综合脚手架计算，其高度按加层建筑物的高度，脚手架的定额步距按外地坪至加层建筑物外墙顶的高度。
E.
加层建筑工程部分，按综合脚手架计算，其高度按加层建筑物的高度加2.5m，脚手架的定额步距按原屋面至加层建筑物外墙顶的高度。
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