观象山地磁房原是青岛观象台的子午仪室 1926 年参加第一届万国经度测量。这 是我国近代天文界参加的第一项国际科研合作项目意义重大。()
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蚯蚓的心脏实际上是能够搏动的血管,其管壁细胞与其功能适应的是()
A. 具有发达的微丝系统
B. 具有发达的微管系统
C. 具有发达的中间纤维系统
D. 具有发达的肌纤维系统
血液中血管中能够作定向流动的最低等的动物是()
A. 纽虫
B. 蚯蚓
C. 蝗虫
D. 鱼
Whichtwodesignconcernsmustbeaddressedwhendesigningamulticastimplementation?()
A. onlythelow-order23bitsoftheMACaddressareusedtomapIPaddresses
B. onlythelow-order24bitsoftheMACaddressareusedtomapIPaddresses
C. onlythehigh-order23bitsoftheMACaddressareusedtomapIPaddresses
D. onlythelow-order23bitsoftheIPaddressareusedtomapMACaddresses
E. the0x01004fMACaddressprefixisusedformappingIPaddressestoMACaddresses
F. the0x01005eMACaddressprefixisusedformappingIPaddressestoMACaddresses
WhichtwostatementsarecorrectregardingFlexLinks?()
AninterfacecanbelongtomultipleFlexLinks.
B. FlexLinksoperateonlyoversinglepairsoflinks.
C. FlexLinkpairsmustbeofthesameinterfacetype
D. FlexLinksautomaticallydisableSTPsonoBPDUsarepropagated
E. FailoverfromactivetostandbyonFlexLinkstakeslessthanasecond