英德
有道
百度
谷歌
图片
维基
百科
直积 [zhí jī]
[数] direct product
- 给出了两个半群的半直积和圈积为左群的充分必要条件以及半直积的结构。
In this peper necessary and sufficient conditions for the semidirect products and wreath products of two semigroup are given. - 从终对象、逆向极限、直积等方面给出集体拉回、I-拉回及广义拉回的等价刻划。
Gives the equivalent characterizations of collective pullback, I-pullback and generalized pullback by means of terminal object, inverse limit and direct product respectively. - 采用内、外表直积法，对风动水泵进行了SN比试验分析，确定了其最佳参数组合。
The paper analyzes the pneumatic pump for SN-ratio test by use of the direct-product of internal and external tables , and has determined the optimal parameters.
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