允许年停机时间为53分钟的系统，其可用性指标为 (14) 。A．99.9% B．

“肉眼血尿”时其每升尿液中的含血量至少超过（）

A.1ml

B.2ml

C.3ml

D.4ml

E.5ml

二次项法又称“T-M模型”，通过回归的算法来确定基金经理是否具有择时能力。( )

Frame Relay is simplified form of (71) , similar in principle to (72) , 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 (73) . Most Virtual Circuits are (74) ,which means that the network provider sets up all DLCI connections at subscription time. (75) are also part of the Frame Relay specification . They privide a link that only lasts only as long as the session.

A．Datagram Switching

B．Datagram Routing

C．Packet Switching

D．packet Routing

As a result of the strong sun, my new dining room curtains _____ from dark blue to gray within a year.

A．faded

B．fainted

C．paled

D．diminished

纠正脊麻引起的低血压，最好兴奋（）

A.α肾上腺素能受体

B.β肾上腺素能受体

C.α和β肾上腺素能受体

D.心肌的α肾上腺素能受体

E.心肌的β肾上腺素能受体