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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( )。
儿童通过观察他人所表现的行为及其结果中获取信息称为()。
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。
作物抗虫性机制有哪些?
采用电子计算机替代手工记账的企业,应当具备()等基本条件。
机体抵抗病原微生物感染的功能称为()。
不属于模拟机定位机安全设施的是( )
构成比常用的表示方式为( )。
业务流程图的特点是什么?
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