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【单选题】
一半径为R的圆盘上均匀分布着正电荷，在垂直于圆盘且过圆心c的轴线上有a、b、d三个点，a、b、c、d四点中相邻两点的的距离均为R，在a点处有一电荷量为q (q>0)的固定点电荷．已知b点处的场强为零，则d点处场强的大小为【图片】A.
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B.
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C.
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D.
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【简答题】句子翻译 1. Language is a specifically human activity. 2. When and how did human beings acquire language? To what extent is language innate, and to what extent is it learned? 3. The ultimate origin of lan...
【判断题】Any child who is capable of acquiring some particular human language is capable of acquiring any human language spontaneously and effortlessly.
A.
正确
B.
错误
【简答题】Language is human ____, which is very different from other means of communication systems by other species.
【单选题】生物圈中有多种多样的生态系统．以沼泽植物占优势，动物的种类也很多，具有净化水源、蓄洪抗早作用的生态系统是（ ）
A.
森林生态系统
B.
淡水生态系统
C.
海洋生态系统
D.
湿地生态系统
【简答题】Animal communication systems are genetically transmitted, while human language is ______ transmitted. That is, human language is passed on from one generation to the next by teaching and learning, rat...
【单选题】What is the best title of the passage?
A.
How Language Came into Being
B.
Language and Human Experience
C.
Poet: a Master of Words
D.
Language and Its Use
相关题目：
【单选题】生物圈中有多种多样的生态系统．以沼泽植物占优势，动物的种类也很多，具有净化水源、蓄洪抗早作用的生态系统是（ ）
A.
森林生态系统
B.
淡水生态系统
C.
海洋生态系统
D.
湿地生态系统
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