提出用双环孔径记录进行激光散斑照相的方法。

A double annular aperture method is put forward with which the authors recorded the processes of laser speckle photography.

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本机是利用环孔形对荒管进行冷态轧制的工艺设备。

This machine is the use of annular-shaped tube on the shortage of cold rolling process equipment.

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因此，研究循环孔隙水压力作用下砂床土体的力学行为对海岸和近海工程有重要意义。

Therefore, it's very important to study the mechanical behavior of sand soils under the action of cycle pore water pressure for coast and offing engineering.

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