1277、预应力混凝土后张法构件中，混凝土预压前第一批预应力损失应为（）。

• A.<img src="https://timg.fentiku.com/javaimportItems/699bb583aa61424f8877b39dc0970d5b/images/1df1.png"><br/>
• B.<img src="https://timg.fentiku.com/javaimportItems/699bb583aa61424f8877b39dc0970d5b/images/22d3.png"><br/>
• C.<img src="https://timg.fentiku.com/javaimportItems/699bb583aa61424f8877b39dc0970d5b/images/287c.png"><br/>
• D.<img src="https://timg.fentiku.com/javaimportItems/699bb583aa61424f8877b39dc0970d5b/images/2ebe.png"><br/>

正确答案：A