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【多选题】
工程变更是建筑施工生产的特点之一，工程变更的主要原因包括（ ）。A.
承包方对项目提出新的要求
B.
由于现场施工环境发生了变化
C.
由于使用新技术有必要改变原设计
D.
由于设计上的错误，必须对图纸作出修改
E.
由于招标文件和工程量清单不准确引起工程量增减
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