... 二阶概率密度 second-order probability density 二阶积 second-order product 二阶积分微分方程 second-order integral differential equation ...
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second-order product moment [数] 二阶乘积矩
In order to solve the problem that there were injection molding bugs on the products caused by the unevenness of the thickness, and the insert in the product, second injection mold was applied.
为了解决产品由于壁厚不均匀且带有嵌件而产生的注射成型缺陷问题，决定采用二次注射的方法。
The second-order Boolean difference was obtained by double transform operations to produce new product items, and the same product items were deleted.
二阶布尔差分通过两次变换产生新积项，并删除相同积项来得到。
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