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.

（66）是（）

A.concentrative

B.distributed

C.aggregate

D.distributing

以下四台同一系列的后向机翼型离心通风机，均在高效率运行情况时，比较其噪声性能哪一台为最好

A．风量50000m³/h，全压600Pa，声功率级105dB
B．风量100000m³/h，全压800Pa，声功率级110dB
C．风量80000m³/h，全压700Pa，声功率级110dB
D．风量20000m³/h，全压500Pa，声功率级100dB