患儿，男，6岁，入学查体胸透发现左侧胸腔第6胸椎旁有直径6mm圆形肿块影。最可能的诊

慢性骨髓炎死骨摘除术的指征是（）

A.发热，局部红肿，有死骨及死腔

B.开放性骨折感染，骨折尚未愈合，有大块死骨

C.有死骨、死腔，包壳形成薄弱

D.死骨分界不清，有死腔与窦道

E.骨包壳充分形成，有死骨、死腔

利用Excel对数据的日常动态管理的主要程序是（）

A.创建电子表格

B.设立项目

C.输入信息，建立数据库

D.查询信息

E.分类汇总

男，65岁，急性下壁心肌梗死第2天，心电监测示第二度Ⅰ型房室传导阻滞，心室率50次／分，血压110/70mmHg。（）

A.临时心脏起搏器植入

B.肾上腺素

C.直流电复律

D.毛花苷丙（西地兰）

E.阿托品下列各例治疗应首选

要查询Information表中学生姓中含有“张”的学生情况，可以用下列哪个命令______

A) SELECT*FROM Information WHERE s_name='张'
B) SELECT*FROM Information WHERE s_name LIKE'张%'
C) SELECT*FROM Information WHERE s_name LIKE'张'
D) SELECT*FROM Information WHERE s_name LIKE'%张%'

(1) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (2) , an application-layer protocol, authenticates each peer in an IPsec transaction. IKE negotiates security policy, determining which algorithm may be used to set up the tunnel. It also handles the exchange of session keys used for that one transaction.

Networks that use (3) to secure data traffic can automatically authenticate devices by using (4) , which verify the identities of the two users who are sending information back and forth. IPsec can be ideal way to secure data in large networks that require secure connections among many devices.

Users deploying IPsec can (5) their network infrastructure without affecting the applications on individual computer. The protocol suite is available as a software-only upgrade to the network infrastructure. This alows security to be implemented without costly changes to each computer. Most important, IPsec allows interoperability among different network devices, PCs and other computing systems.

1（）

A．Certificate

B．Encryption

C．Tunnel

D．Presentation