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底拱
tech. inverted arch
底拱在巷道底板设置的连接两侧墙〈岩〉体、拱矢向下的拱植
expl. floor arch; inverted arch; invert
底拱
: 50 phrases in 9 subjects
Architecture5
Automobiles1
Electronics1
Engineering geology2
Hydroelectric power stations1
Metallurgy4
Oil / petroleum2
Plastics3
Technology31

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