prestressed hollow beam 预应力空心梁
hollow slab beam 空心板梁
dark hollow beam 暗中空光束
focused hollow beam 聚焦中空光束
hollow beam hoisting 空心梁吊装
localized hollow beam 局域中空光束
anomalous hollow beam 异常空心光束
hollow-beam distribution 空心束分布
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Its results not only may be applied to the gun with solid beam, but also to the gun with hollow beam.
其结果既造用于实心注电子枪，也造用于空心注球形电子枪。
The phenomenon of hollow beam emerged by conical refraction from biaxial crystal, have been noticed in the early nineteenth century.
双轴晶体锥形折射产生空心光束的现象早在十九世纪初就被人们所注意。
The hollow beam construction not only produce the stress concentration, reduce the effect of beam mass but also extended the bandwidth.
采用空心梁结构不仅能产生应力集中而且能减少梁的自身质量带来的影响，可以有效地展宽频带。
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