The average distribution grade of iron in the earth's crush is 5%, and it has no mining value.

The average distribution grade of iron in the earth's crush is 5%, and it has no mining value. A: 正确 B: 错误

In the southwestern part of the United States _________ built in the last century. A: they are many abandoned mining towns B: where there are many abandoned mining towns C: are many abandoned mining towns D: many abandoned mining towns are

In the southwestern part of the United States ______ built in the last century. A: there are many abandoned mining towns B: were many abandoned mining towns C: where there are many abandoned mining towns D: where are many abandoned mining towns

Data Mining：

he main production links of open-pit mining production technology include rock preparation, mining and loading, transportation and .

In mining industry, “black diamonds” are （ ）.

The level with is called the mining level.

Which of the following is not a basic procedure for text mining? A: Text preprocessing B: Text classification C: Text transformation D: Text mining

请大家利用网络搜索引擎，探索下列数据挖掘常用的工具，并完成下表的填写。序号数据挖掘工具主要特点1RapidMiner（1）2WEKA（2）3Orange（3）4R语言（4）5Mining（5）