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多项选择题

无粘结预应力混凝土施工方法的说法，正确的是（）。

A.不需要预留孔道和灌浆
B.张拉时摩擦阻力较小
C.预应力筋易弯成曲线形状
D.施工简单、工程造价低
E.属于后张法预应力混凝土

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