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火山碎屑按其粒径大小可分为（）、火山角砾、火山灰、火山尘。

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合格的电话呼叫人员必须具备一定的（），否则就难以胜任呼叫服务工作。

A. 计算机知识和操作常识
B. 能力和素质
C. 业务和服务

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来源于中胚层的一群细胞，具有自我更新和多向分化潜能的多能干细胞（）

A. HSC
B. HLA
C. ES
D. MSC
ECM

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While performing a site survey to document the existing environment before implementing a new HACMP cluster， it was discovered that a port filtering firewall was being used to protect the production system. The plan is to continue using the firewall and add a second firewall to avoid a single point of failure. Each node in the two-node cluster will have all of its network adapters connected to the firewalls， and all connections to the nodes will pass through these firewalls. What must be considered about HACMP in a firewall environment？（）

A. Firewalls are not supported in a HACMP environment.
B. HACMP uses only TCP/IP so firewalls are not relevant.
C. Specific ports must be open for HACMP communications.
Dynamic routing must be used to properly route packets in a firewall-protected environment.

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格里菲思准则的基本思想及假定，修正的准则主要考虑何种因素进行修正？

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