The pre -flexed composite beam is a new type structure with a large span, which can be widely used in various fields involving in civil engineering.
予弯复合梁是一种新型的大跨度结构，可用于土木工程的各个领域。
The pre -flexed composite beam is a new type structure with a large span, which can be widely used in various fields involving in civil engineering.
予弯复合梁是一种新型的大跨度结构，可用于土木工程的各个领域。
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