在西部实行退耕还林、还草，原因是[ ] A．该地牧业发达，牲畜需要大量的饲料 B

关系营销和交易营销的主要区别是（）

A.交易营销的核心是交易，关系营销的核心是关系

B.交易营销把其视野局限于目标市场上，关系营销所涉及的范围则广得多

C.交易营销强调如何获得顾客；关系营销更加强调保持顾客

D.交易营销不太强调顾客服务；关系营销高度强调顾客服务

人民检察院对行政机关及其公务员的监督范围包括以下几个方面？（）

A.法纪检察

B.经济检察

C.侦查监督

D.监所监督

中空玻璃用弹性密封胶的外观质量是怎样规定的？

水底沉管隧道施工：干坞工程基槽浚挖双GPS-RTK定位定深系统可以对船舶进行三维精确定位，其平面定位精度为（）cm。

A、2~3

B、1~2

C、1.5~2

D、2~4

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A. loop B. find C. search D. query