对于夹片式具有自锚性能的锚具，先张法低松弛力筋张拉程序为( )。

• A.0→初应力→1.05σ<img src="https://timg.fentiku.com/35/2016/9/6/JMCNBo6o6R.png" title='JMCNBo6o6R.png' alt='JMCNBo6o6R.png'/>→0.9σ<img src="https://timg.fentiku.com/35/2016/9/6/JMCNBo6o6R.png" title='JMCNBo6o6R.png' alt='JMCNBo6o6R.png'/>→σ<img src="https://timg.fentiku.com/35/2016/9/6/JMCNBo6o6R.png" title='JMCNBo6o6R.png' alt='JMCNBo6o6R.png'/>
• B.0→初应力→1.05σ<img src="https://timg.fentiku.com/35/2016/9/6/AkWgCigMM0.png" title='AkWgCigMM0.png' alt='AkWgCigMM0.png'/>(持荷2min)→0→σ<img src="https://timg.fentiku.com/35/2016/9/6/AkWgCigMM0.png" title='AkWgCigMM0.png' alt='AkWgCigMM0.png'/>
• C.0→初应力→1.03σ<img src="https://timg.fentiku.com/35/2016/9/6/YlDCRPZRAC.png" title='YlDCRPZRAC.png' alt='YlDCRPZRAC.png'/>
• D.0→初应力→σ<img src="https://timg.fentiku.com/35/2016/9/6/M564SdXTKM.png" title='M564SdXTKM.png' alt='M564SdXTKM.png'/>(持荷2min)

正确答案：D