多项选择题

侦察监视的主要应用领域有______________。
A、战略预警
B、防空反导
C、地面战场侦察与监视
D、军事通信

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引起机械性肠梗阻最常见的原因
A.术后肠粘连
B.腹腔内肿瘤压迫
C.先天性肠道闭锁
D.急性腹膜炎
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The Testking Corporation consists of the head office in New York with its regional offices in: Chicago, Detroit, Philadelphia, Toronto, and AtlantA.These offices need to be connected in a WAN, and Testking wishes to do this via a hub and spoke arrangement that will utilize packet-switched technology.Which one of the WAN technologies below would be the best choice for Testking?（）A.ISDNB.WirelessC.Frame RelayD.T1 leased lineE.ATMF.VPN
A.Which
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