A special class of difference set pairs is equal to the perfect binary arrays pairs.
差集偶是一类新的组合设计，一类特殊的差集偶与最佳二进阵列偶是等价的。
A special class of difference set pairs is equal to the perfect binary arrays pairs.
本文提出了一类新的区组设计———差集偶的概念。
Conclusion: Dipsacus is a natural class group, and the slight difference of its poll...
结论：续断属为一自然分类群，花粉粒的细微差异对种的划分有一定意义。
Conclusion: Dipsacus is a natural class group, and the slight difference of its poll...
结论：续断属为一自然分类群，花粉粒的细微差异对种的划分有一定意义。
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