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【单选题】
先后张法预应力混凝土构件,其传递预应力方法的区别是( )
A.
先靠钢筋与混凝土间的粘结力来传递预应力，而后则靠工作锚具来保持预应力
B.
后张法靠钢筋与混凝土间的粘结力来传递预应力，而先张法则靠工作锚具来保持预应力
C.
先依靠传力架保持预应力，而后则靠千斤顶来保持预应力
D.
上述选取不完全正确，应根据实际情况确定构件中传递预应力的方法
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