在视觉识别系统中，设计统一的企业标志、企业名称、企业造型、象征图案、标准字、标准色、标准印刷体、宣传口号等属于（）要素的作业。
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If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）
A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
B. A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
C. A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
D. A SHAM link is part of OSPF network of MPLS-VPN provider
水泥的标号，是将水泥用标准规定方法制成标准试样，在标准条件下养护后进行抗压、抗折强度实验等中（）天的抗压强度数值，即为水泥标号。
A. 3
B. 7
C. 28
D. 8
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