在管道铺设或大型梁架焊接过程中，往往会遇到两个或多个不同轴线的大直径管件相交的情况。
During pipe line laying or large beam support welding, it often meets crossover of two or multi different axis large diameter pipe piece.
本公司生产的背景架使用的材料为直径为48 mm，壁厚为3 mm的优质铝合金。
The material of this truss is steel with Aluminum alloy finished, its diameter is 48mm, and the thickness is 3mm.
一架747飞机内可以装多少个直径一英寸的滚珠轴承？
How many ball bearings, each one inch in diameter, can fit inside a 747 aircraft?
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