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问题 单项选择题 B1型题

适用于提取贵重药材、毒性药材、有效成分含量较低的药材；但不适用于新鲜的及容易膨胀的药材、无组织结构的药材（）

A.浸渍法

B.回流法

C.水蒸气蒸馏法

D.煎煮法

E.渗漉法

答案

参考答案：E

单项选择题

___39___ is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. ___40___, 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 ___41___ to secure data traffic can automatically authenticate devices by using by using ___42___, 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 ___43___ 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.

43（）

A. secure

B. relation

C. script

D. strict
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单项选择题

某工程室内给水管道系统工作压力0.36MPa，按《GB50242-2002建筑给水排水及采暖工程施工质量验收规范》要求进行水压试验，试验压力应为（）。

A、0.36MPa

B、0.54MPa

C、0.60MPa

D、0.81MPa
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