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Paleontologists hypothesize that modern birds evolved from the family of dinosaurs that included Tyrannosaurus rex. This hypothesis would be strongly supported if evidence that dinosaurs from this family had a body covering resembling feathers could be found, but so far no such evidence has been found. Which of the following, if true, would most help the paleontologists explain why no evidence of feathered dinosaurs has yet been found?
小儿风湿热发生心包炎时可表现为( )。
异步电动机额定功率:指电动机在制造厂(铭牌)所规定额定运行状态下运行时,()功率。
胸主动脉瘤的主要临床表现是( )
“六经”不包括?()
机体抵抗病原微生物感染的功能称为()。
骨疡性中耳炎又称做()
不属于模拟机定位机安全设施的是( )
《诗经》中用作宗庙祭祀的乐曲是( )。
我国国民经济信息化中的“三金工程”指的是()