在生产过程中能够产生和散发热量的生产设备、产品或工件等统称为( )。
A.强热辐射源
B.定向辐射场所
C.生产性热源
D.高频热源
参考答案:C
下列哪项因素导致脉搏血氧饱和度偏高()
A.组织低灌注
B.低温状态
C.指甲有指甲膏或其他覆盖物
D.存在高铁血红蛋白血症
E.严重贫血
A local-area network (LAN) is a communications network that (125) a variety of devices and provides a (126) for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster (丛) of buildings. The LAN is usually owned by the same organization that owns the (127) devices. The internal data rate of LAN is at least several Mb/s.
The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a (128) shared, By other stations. A transmission from any one station is (129) to and received by all other stations.
(125)是()
A.broadcast
B.cable
C.control
D.interconnects
E.internet
F.meander
G.means
H.medium
I.modem
J.output switch relay