【单选题】【消耗次数：1】
外层空间与空气空间的界限
①
以航空器向上飞行的最高限度为界
②
以有空气存在的大气层的高度为界
③
已经确定
④
尚未确定
参考答案：
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相关题目
【多选题】
逆温是空气温度随高度增加而增高的大气垂直层结现象，逆温层是指出现逆温现象的极其稳定的大气层。逆温可分为（）等
①
A锋面逆温
②
B辐射逆温
③
C平流逆温
④
D下沉逆温
【单选题】
航天运载器技术是航天技术的基础，必须利用航天运载器克服地球引力和空气阻力将航天器送到外层空间一下关于运载火箭的描述，正确的是（）。
①
A.运载火箭主要由动力系统，控制系统整流罩和无线电测量系统组成
②
B.运载火箭主要由推进剂控制系统箭体结构和无线电测量系统组成
③
C.运载火箭主要由动力系统，控制系统，箭体结构和无线电测量系统组成
④
D.运载火箭主要由动力系统，制导系统。箭体结构和无线电测量系统组成
随机题目
【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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【单选题】
下列哪种方式是幼儿老师与家长谈话交往时较好的方式（ ）。
①
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谈话时不涉及别的孩子，以平等的身份采用日常用语与家长交谈
②
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只是向家长报告孩子的优点，让家长高兴
③
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对存在问题的孩子，向家长指出他们的教育观有问题
④
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只是向家长谈幼儿的问题，要家长注意或配合教育孩子
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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