值班人员要熟悉机房设备原理，遵守机房安全管理制度、通信纪律及保密制度。

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A．loop

B．find

C．search

D．query

依次填入下列各句横线处的词语，最恰当的一组是[ ]

①房地产市场泡沫主要是一种信息泡沫，这是由开发商及其代言人__________制造的，其目的是误导消费者，拉高房价，牟取暴利。

②市场竞争，其核心是人才的竞争。于是一些企业和部门为人才而不择手段地挖对手的_________，严重干扰了正常的市场秩序。

③汪曾祺主要从事文学创作，偶尔也写些评论，_________总的说来，他天生就是一个作家，________很难算是一个纯粹的学者。

A．刻意 墙角 但/而

B．蓄意 墙脚 但/而

C．刻意 墙脚 不过/也

D．蓄意 墙角 不过/也

魏氏法测定血沉使用的抗凝剂是()

A．3.8%枸橼酸纳

B．双草酸盐

C．肝素

D．109mmol/L枸橼酸纳

E．EDTA-K2

现场急救过程中采取复苏体位的最重要意义就是防止误吸。

社区居民自治的特点有哪些？