Frame Relay is simplified form of (66) , similar in principle to (67) , in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as (68) . Most Virtual Circuits are (69) , which means that the network provider sets up all DLCI connections at subscription time. (70) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

67（）

A．X.21

B．X.25

C．X.28

D．X.29

对地层流体粘度大的油井，电潜泵欠载停泵后的处理措施是（）。

A、降低套压

B、缩小油嘴

C、上调欠载设定值

D、反循环洗井