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拱券
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拱券
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拱券
由块状料(砖、石、土坯)砌成的跨空砌体。是拱和券的合称。利用块料之间的侧压力建成跨空的承重结构的砌筑方法称发券,用此法砌于墙上做门窗洞口的砌体称券;多道券并列或纵联的构筑物(水道、屋顶)称筒拱,用此法砌成的穹窿称拱壳。
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EMC
EMCCD
EMC technology of electric vehicle
EMC testing between spacecraft and launch site
EMC testing between spacecraft and launch vehicle
EMC testing of the launch vehicle
EMC testing system
EMC test of the spacecraft in-orbit
EMC测试系统
EMD
Emden
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Emden differential equation
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