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问题 选择题

“两个黄鹂鸣翠柳，一行白鹭上青天”这一句体现了动物对人类哪方面的作用[ ]

A．在科学和技术上给人们的启迪      

B．给人类的享受和成为文学创作的源泉  

C．动物和人类的和谐共处            

D．提供肉、蛋等作为人类的食物

答案

答案：B

单项选择题 B1型题

急性粒细胞白血病可见（）

A.周围血中幼稚细胞、原始细胞>0.15

B.周围血有较多幼稚粒细胞伴嗜酸、嗜碱性粒细胞增多

C.周围血中幼红、幼粒细胞易见，骨髓呈现"干抽"

D.周围血中出现较多异形淋巴细胞

E.周围血中易见盔形细胞、小球形细胞及破碎红细胞
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单项选择题

___57___ is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. ___58___, 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 ___59___ to secure data traffic can automatically authenticate devices by using by using ___60___, 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 ___61___ 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.

60（）

A. characteristics

B. associated links

C. digital certificates

D. attributes
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