Where possible, the closed position should be determined by leak test using water or air, under low pressure.
如果可能的话，可以用水或空气，在低压状态下，对关闭状态进行测试，看看有没有泄漏。
The rigidity calculation of the closed thin - walled section rod structure of aircraft is carried out by using finite element method and the result tallies with the full - scale test value well.
利用有限元法对飞机闭合薄壁剖面杆结构进行刚度计算，其结果与全尺寸试验值吻合较好。
The rigidity calculation of the closed thin - walled section rod structure of aircraft is carried out by using finite element method and the result tallies with the full - scale test value well.
利用有限元法对飞机闭合薄壁剖面杆结构进行刚度计算，其结果与全尺寸试验值吻合较好。
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