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问题 单项选择题

（2007）RLC串联电路如图所示，其中，R=1kΩ，L=1mH，C=1μF。如果用一个100V的直流电压加在该电路的A-B端口，则电路电流I为：（）

A.0A

B.0.1A

C.-0.1A

D.100A

答案

参考答案：A

改错题

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。  

增加：在缺词处加一个漏字符号(/\)，并在其下面写出该加的词。   

删除：把多余的词用斜线(\)划掉。   

修改：在错的词下划一横线，并在该词下面写出修改后的词。   

注意：1. 每处错误及其修改均仅限一词；   

2. 只允许修改10处，多者(从第11处起)不计分。   

Every one of us can make a great efforts to cut off the use of energy in our country. To begin with, all of us can start reducing to the use of oil by driving only when you have a real need. That won't be easy, but we have to start anywhere. What's more, we can go to work by bike once and twice a week, and we can also buy smaller cars that burn more oil. Other way is to watch our everyday use of water and electric at home. For example, how many times have you walked out of a room, leaving the lights when no one’s there?
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选择题

As we stood on the top of the hill, we could see the beautiful  scene that ____ before us.   [ ]

A. had spread                      

B. has spread    

C. spread                            

D. spreads
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