小儿出生后生长发育最迅速的时期是（）。 A.新生儿期 B.婴儿期 C.幼儿期 D.学 发布时间：2021-01-15 12:35 │ 来源：www.tikuol.com 题型：单项选择题 问题： 小儿出生后生长发育最迅速的时期是（）。A.新生儿期B.婴儿期C.幼儿期D.学龄前
题型：单项选择题 患者，女，20岁，3个月前因皮肤黏膜出血诊断为血小板减少性紫癜，用泼尼松治疗缓解。近1周来疲乏无力。脾肋下2cm，血红蛋白70g／L，网织红细胞0.06，血小板60×109／L，白细胞数正常，血清总胆红素76umol／L，间接胆红素66umol／L，骨髓增生明显活跃，以幼红细胞增生为主，巨核细胞35个，Coombs试验阳性。其诊断是（）A.血小板减少性紫癜并发贫血B.骨髓增生异常综合征C.Evans综合征D.脾功能亢进E.药物引起的溶血反应 查看答案
题型：单项选择题 The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth. By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist. Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf. After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface.The phrase "throw off" underlined in Paragraph 3 most probably means ______ .A．ejectB．burn upC．convertD．let in 查看答案