Prestressing by（）involves installing and stressing prestressing strand of bar tendons only after the concrete has been placed, hardened and attained a minimum compressive strength for that transfer.
Prestressing by（）involves installing and stressing prestressing strand of bar tendons only after the concrete has been placed, hardened and attained a minimum compressive strength for that transfer.
A tendon with a duct that contains multiple pieces of prestressing steel strand is commonly called a（）tendon.
A tendon with a duct that contains multiple pieces of prestressing steel strand is commonly called a（）tendon.
When grease is used, the prestressing steel is permanently free to move relative to the sheathing and the tendon is referred to as an]（）tendon.
When grease is used, the prestressing steel is permanently free to move relative to the sheathing and the tendon is referred to as an]（）tendon.
In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component.
In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component.
In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component. A: 正确 B: 错误
In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component. A: 正确 B: 错误
The loss of prestressing concrete members after the preloading of concrete (the second batch) is A: [img=146x34]1803b952676ef16.png[/img] B: [img=143x41]1803b9526fa4eb0.png[/img] C: [img=36x29]1803b95277ef881.png[/img] D: [img=93x35]1803b9527fd24f9.png[/img]
The loss of prestressing concrete members after the preloading of concrete (the second batch) is A: [img=146x34]1803b952676ef16.png[/img] B: [img=143x41]1803b9526fa4eb0.png[/img] C: [img=36x29]1803b95277ef881.png[/img] D: [img=93x35]1803b9527fd24f9.png[/img]