短語詞組短語prestress tensioning equipment 預應(yīng)力張拉設(shè)備past -tensioning prestress 后張法預應(yīng)力post tensioning prestress 后張預應(yīng)力post -tensioning method prestress structure 后張法預應(yīng)力結(jié)構(gòu) 返回 prestress tensioning