某借款人所在学校学制为4年，每年的学费为8000元，其在校4年期间总计可申请的国家助

Frame Relay is simplified form of (51) , similar in principle to (52) , 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 (53) . Most Virtual Circuits are (54) , which means that the network provider sets up all DLCI connections at subscription time. (55) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

A．Permanent Circuits

B．Permanent Virtual Circuits

C．Switched Virtual Circuits

D．Switched Circuits

小规模纳税企业销售货物或者提供劳务时既可以开具增值税普通发票，也可以开具增值税专用发票。

恶性高血压与急进型高血压的区别要点是（）

A.眼底有无视 * * 水肿

B.舒张压的高低程度

C.有无肾功能不全

D.有无心功能不全

E.有无脑功能障碍

产业结构( )要求在一定的经济发展上，根据消费需求和资源条件，理顺结构，使资源在产业间合理配置，有效利用。

A．合理化

B．高级化

C．融合化

D．生态化

热敏电阻正是利用半导体（）数目随着温度变化而变化的特性制成的（）敏感元件。