空心管,管梁
These years, along with the development of Laser technology and its extension of application, the generation and application of Hollow Beam Laser have been more and more advertent.
近几年来,随着激光技术的不断发展和应用领域逐步拓展,圆环光束的产生和应用引起人们更多的关注。
At the same time, which cross-section form and dimension of prestressed hollow beam can bring better economic preformance is studied by writing computer program, and the optimum cross-section under the project condition in this paper is obtained.
同时,编写程序对空心板梁截面形式和尺寸的经济性进行分析,并得出在本文工程条件中的最优截面。
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