工程咨询服务费用的估算是以( )中拟定的工作量和预期成果目标为依据，估算完成咨询任务所需要的人力、物力、时间和费用。

A．技术建设书

B．工作大纲

C．投标邀请函

D．财务建议书

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

The key to SNMP  （） is its simplicity. It has a small command set that does a good job of collecting information from  （） any network device. In a SNMP environment,  （） of the work is handled by the network management system. Devices that are being managed are not  （） with processing  （） that might affect their performance.

The key to SNMP（） is its simplicity.

A．popularity

B．function

C．efficiency

D．power