让孩子用把柄上戏有绳子的扫帚，绳子的另一头还系有块吸铁石，向钓鱼一样的去吸图形卡片。
Have the children fish for shapes using a broom with a string tied around the handle and a magnet on the end of the string.
给出了循环几乎可分解的循环有向三元系的一些直接构造和递归构造。
The direct and recursive constructions for a cyclically almost resolvable cyclic directed triple system are given.
大岗山植物区系是典型的亚热带植物区系，有由热带成分向温带成分过渡的特点，成为许多热带性属的分布北界。
The study indicates that the Dagangshan has a typical subtropical flora and is characteristic of floristic transition from tropical to temperate composition.
对有向三元系超大集(oldts)的存在性进行了讨论。
The existence of the overlarge sets of directed triple systems (OLDTS) is investigated.
对有向三元系超大集(oldts)的存在性进行了讨论。
The existence of the overlarge sets of directed triple systems (OLDTS) is investigated.
应用推荐