按照经营商品的范围分类，批发商可以分为（）。 A.普通商品批发商 B.完全职能批发商

(66) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (67) , 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 (68) to secure data traffic can automatically authenticate devices by using (69) , 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 (70) 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.

A．secure

B．relation

C．script

D．strict

下列的事件：①在标准的大气压下，水加热到90℃时沸腾；②在常温下，铁熔化；③掷一枚均匀的硬币，出现正面；④实数的绝对值不小于0．其中必然事件有（　　）

A．1个

B．2个

C．3个

D．4个

厨房的墙壁上常会附着很多小油滴，这属于______现象，严冬室外一直冰冻的衣服干了，这属于______现象．

患者男，44岁，来院体检。膀胱B型超声：膀胱右壁 * * 状新生物，直径2cm。

患者诊断为膀胱肿瘤，在连续硬膜外麻醉下行TURBT术，最好的手术切除方法为（）

A.顺行切除法逐块切除肿瘤

B.逆行切除法逐块切除肿瘤

C.垂直点切法逐块切除肿瘤

D.直接将肿瘤进行气化

E.直接从肿瘤基底部切除肿瘤

溶血性黄疸时，下列哪一项不存在

A．血中游离胆红素增加
B．粪胆素原增加
C．尿胆素原增加
D．尿中出现胆红素
E．粪便颜色加深