反映成年人中心性肥胖的指标是什么？

802.11b/g工作于哪个频段？（）

A.5.8GHz

B.2.4GHz

C.3.9GHz

乳香与没药的共同功效是（）

A.活血通经

B.活血止痛

C.破血消

D.利水消肿

E.消肿生肌

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．Datagram Switching

B．Datagram Routing

C．Packet Switching

D．packet Routing

试述霍桑试验？

过负载（）电气事故发生的基本原因之一。

A.是

B.不是

C.可能是