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河上的桥为单跨桥。
梯级橡胶坝由4座单跨充水枕式橡胶坝组成。
The cascade flexible dam consists of 4 single spans Water filling, and pillow-type flexible DAMS.
单跨和多跨水下悬空管线在水流作用下发生涡激振动。
Vortex-excited vibration induced by fluid takes place on the underwater suspended pipelines.
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