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问题 多项选择题

旋流器能高精度分选是因为（）。

A.旋流器内有强大离心力

B.旋流器内有一个贯通底流口和溢流口的空气柱

C.矸石被外旋液流带向底流口排出

D.密度接近介质的颗粒在旋流器经过若干次循环才排出

答案

参考答案：A, B, C, D

问答题

已知2Fe3++Fe→3Fe2+2Fe3++Cu→2Fe2++Cu2+

Ⅰ向FeCl3溶液中加入铁粉和铜粉混合粉末，充分反应后，分析溶液中的溶质和可能残留固体不溶物的成分．

请完成下列表格

序号溶液中的盐固体不溶物的成分
①FeCl2、CuCl2、FeCl3______
②______无
③FeCl2、CuCl2______
④______Cu
⑤______Fe、Cu
Ⅱ今有一包铁粉和铜粉混合粉末，为确定其组成，现提供0.65g/mL的FeCl3溶液（其他用品略），某课外活动小组同学的实验结果如下（假定反应前后溶液体积不变）．

组别①②③④
混合粉末质量/g40404040
FeCl3溶液体积/mL150300330350
反应后剩余固体质量/g23.26.42.56x
（1）试判断第④组剩余固体质量x为______．

（2）通过计算判断第②组剩余固体的成分．

（3）求原混合粉末中Fe、Cu的物质的质量之比．
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单项选择题

The grid computing is a new (66) technology connecting the distributed and (67) resources to the high-speed network and integrating a super-computer of processing capacity. The significance and architecture of the grid computing is explained. Several kernel technology such as OGSI, resource management, task management, task scheduling, high rate communication and security are described. Aiming at the particularity of the grid computing environment a mechanism similar to the technology of the search engine is designed to registry, discovery and (68) the resources in the grid. The whole model of the resource management is built by connecting task manager in the local resource management system to others with P2P model. The task may migrate among the task managers in order to (69) the load. The task users summit may be executed in relatively tight resource set, which will not only decrease the total communication overheads of the whole task but also (70) the performance of the system.

（68）处填（）。

A．search for

B．find

C．look for

D．locate
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