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某文件系统采用多级索引结构，若磁盘块的大小为512B，每个块号需占3B，那么根索引采用一级索引时的文件最大长度为（）KB；采用二级索引时的文件最大长度为（）KB.
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[音频]1. Hallowe'enHallowe'en is a popular festival in many countries [填空1], and every year it seems to get bigger. It's getting dark earlier and it's starting to get [填空2]. Christmas is still a long way away. We need something to [填空3] and take our minds off the fact that winter is nearly here. Find out some more about the [填空4]festival of Hallowe'en.2. The origins of the nameThe festival of Hallowe'en has its roots in Celtic and Roman traditions. Over [填空5] years ago the Celts in Britain, Ireland and parts of France celebrated Samhain to mark the beginning of winter. When the Romans invaded, they merged this with Feralia, their [填空6]of the passing of the dead. As Christianity spread, the Church tried to [填空7]these pagan feasts (异教徒的节日) [填空8]official Church holy days. One of these was November 1. It was called All Saints Day, or "All Hallows", and October 31 was known as “All Hallows' Eve”, and then Hallowe'en.3. Hallowe'en traditionsIn the past there was a tradition called “souling”. Poor people [填空9] houses asking for food. In exchange, they promised to say prayers for the dead. People no longer go souling, but the habit has been [填空10] a modern Hallowe'en game for children in America, who [填空11] as ghosts, witches and monsters and go around people’s houses, [填空12] sweets. This game is called ‘Trick or Treat’.4. WitchesHallowe'en wouldn't be fun [填空13] witches. Witches have always been part of popular folklore (民间传说). Shakespeare's play "Macbeth" opens with three witches. A witch was someone- usually a woman-who had [填空14] powers and had dealings with the devil. The American town, Salem, in the state of Massachusetts, is famous for the "witchcraft trials" which [填空15] there in 1692.5. PumpkinsThe pumpkin has become [填空16]Hallowe'en. People [填空17] a pumpkin, cut a face into the side, and put a candle inside to make a lamp. It's known as a Jack O' Lantern, from an Irish legend about a man called Jack, who [填空18] the devil.6. AnimalsBlack cats, frogs, mice and spiders are just some of the animals associated with Hallowe'en. Generally, [填空19] the animal, the stronger the Hallowe'en connection. Nocturnal (夜间活动的) animals like bats are particular favorites, and if, as is the case with vampire bats, they like [填空20] blood, they are high on the Hallowe'en list.
非齐次线性方程组的解的集合是一个向量空间。
非齐次线性方程组的通解表示为其一个特解与导出组（对应的的齐次线性方程组）的通解之和。
党的（）提出了到2020年全面建成小康社会的奋斗目标。
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