抽油机底座的鉴定:用专用水平仪按底座()测量其水平度,如水平度超差太大或有扭曲现象应修复或按报废处理。
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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。
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