同时凸形地基也易于清洁。

At the same time convex foundation also easy to clean.

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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.

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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.

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