催化剂活性越高，转化率越高。为达到高的汽油收率，催化剂活性越高越好。
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治安保卫重点单位应当按照国家的有关标准对重点部位设臵必要的（）设施。
A. 技术防范
B. 物理防范
C. 安全防范
D. 人防
When considering the design of the IPv6 address plan for the Enterprise Campus network， whichof the following should serve as guidance？（）
All the IPv6 subnets should use a /32 prefix
B. Set aside /31 prefixes to support point-to-point links and loopback interfaces
C. The IPv6 address plan should be designed to support the service block model design orintegration with IPv4
Designate 16 subnet bits to be split up intelligently， either by OSPF area. VLAN numbering， orIPv4 mapping
二元式中央银行制度是指中央银行体系由中央和地方两级相对独立的中央银行机构共同组成。美国、德国是实行这种体制的典型国家。
A. 正确
B. 错误
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