inner set

the quality of the internal surface can be greatly improved and the punch force can be significantly reduced by using inner set hose.

内置软管可以有效改善管材的内表面质量，并显著减小冲头推力。

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a necessary and sufficient condition for an inner set space with three critical sets which can be weighted is also given.

给出了具有三个临界集的内集空间可以赋权的一个充分和必要条件。

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