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问题 多项选择题

特高压直流输电的稳定性主要取决于（）。

A.有效短路比

B.有效惯性常数

C.短路容量

D.短路电流

答案

参考答案：A, B

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书面表达。
        以下表格是对青少年问题的问卷调查。请根据表格提供的信息，选择其中的三条，写一篇
100个词左右的调查报告，并给出解决问题的建议。调查报告的开头已经给出。
               Problems                                         Causes
Feeling stressedtoo much homework; don't have enough time for their hobbies
Getting short-sighted (近视的)too much homework; bad reading and writing habits
Fighting with each otherdon't know how to get on well with classmates
Feeling tired of studycomputer games' bad influence
Getting fathaving more pocket money to buy snacks; dislike doing exercise
      According to our survey, many teenagers have problems as grown-ups, but if they can solve the
problem properly, they can develop better.                                                                                    
                                                                                                                                                
                                                                                                                                                
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单项选择题

格子细胞是由哪种细胞转变而来（）

A.星形胶质细胞

B.少突胶质细胞

C.室管膜细胞

D.小胶质细胞

E.神经细胞
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