“民为贵，社稷次之，君为轻”出自（）。

某人午觉醒来，发现表停了，他打开收音机，想听电台的整点报时，则他等待的时间不多于10分钟的概率是______．

2008年的汶川地震给很多企业及其员工造成了惨重的财产和人身伤亡损失，地震风险属于（）。

A．基本风险

B．特定风险

C．投机风险

D．社会风险

多发性硬化CT表现的三大特点

A．病灶小

B．多发

C．位于脑室旁

D．急性期病灶可强化

E．无占位效应

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.

（67）处填（）。

A．isomorphic

B．different

C．heterogeneous

D．alien

纳税人办理下列事须持税务登记证件：（）

A、减税

B、领购发票

C、退税

D、免税