题型:问答题 简答题 若要求分解既具有无损连接性,又保持函数依赖,则模式分解()。A.可以达到BCNFB.可以达到3NF,也能达到BCNFC.不能达到3NFD.可以达到3NF,但不一定能达到BCNF 查看答案
题型:问答题 简答题 10个月男婴,双胎之一。因食欲差就诊,查体:欠活泼,面色稍苍白,面部无明显消瘦,两月前曾间断腹泻,测体重7kg,身长73cm,腹部皮下脂肪0.4cm,四肢肌张力尚可。测血色素为90g/L。该患儿合理诊断为()A.正常儿B.单纯营养性贫血C.Ⅰ度营养不良伴营养性贫血D.Ⅱ度营养不良伴营养性贫血E.Ⅲ度营养不良伴营养性贫血 查看答案
题型:问答题 简答题 A “full service” Loran-C receiver will provide().A.matching pulse rates of at least 20 stationsB.an automatic on-and-off switchC.a horizontal matching of all delayed hyperbolic signalsD.automatic signal acquisition and cycle matching 查看答案
题型:问答题 简答题 The vessel has stayed in port for seven days because she needs().A.repairsB.repairingC.repairedD.being repaired 查看答案