它以铜环取代了银环，测试效果完全可靠，并大大降低了集电器的制造成本。

With copper ring instead of silver ring, this collector is fully reliable for measurement and able to largely reduce its manufacture cost.

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对关联规则挖掘问题建立了完全格描述并给出了问题规模下限，提出了一种基于搜索空间划分的项集频度计算模型。

The problem of mining association rules with lattices is descried and the lower bonds of the problem′s are gained.

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讨论了有限维和无限维复J-辛空间上的拓扑，并证明了复J-辛空间的每一个完全J-Lagrangian子流形都是闭集。

We discuss topologies for complex J-symplectic spaces and prove that each complete J-Lagrangian submanifold of the complex J-symplectic spaces a closed set.

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