从受力角度看凸形管帽中从半球形管帽。
From the perspective of convex pipe stress in the cap from hemispherical tube cap.
卷云是“一种低矮的长管形云彩,”它时而平滑,时而臃肿。
A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy.
螺旋形卷管机在哪里?
这个容器呈管形。
小肠是长管形器官。
小肠是长管形器官。
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