锚具是先张法结构或构件中为保持预应力筋拉力并将其传递到混 凝土上用的永久性锚固装置。
参考答案：错
This construction firm has a long history, complete facilities, fine technique and service.
A．believable
B．similar
C．popular
D．considerate
与自由锻相比，模锻具有哪些优点？
