要使平行板电容器两极板间的电势差加倍，同时极板间的场强减半，_爱下问搜题

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问题选择题

要使平行板电容器两极板间的电势差加倍，同时极板间的场强减半，下述四种办法中应采取哪种办法？（　　）

A．两极板的电荷量加倍，板间距离为原来的4倍

B．两极板的电荷量减半，板间距离为原来的4倍

C．两极板的电荷量加倍，板间距离为原来的2倍

D．两极板的电荷量减半，板间距离为原来的2倍

答案

答案：B

单项选择题

下列哪项不符合非住院病人离院标准（）

A.能自行排尿

B.病人重要器官功能恢复稳定、正常

C.神智清醒，能下地行走

D.能口服饮食

完形填空

The moment happened 30 yours ago but it was still fresh in my memory. I was a college freshman and had       up most of the night before laughing and talking with friends. Now just before my first       of the day my eyelids were feeling heavier and heavier and my head was drifting down to my desk to make my textbook a      . A few minutes nap（小睡）time before class couldn’t     , I thought.
BOOM! I lifted my head suddenly and my eyes opened wider than saucers. I looked around with my      beating wildly trying to find the cause of the       . My young professor was looking at me with a boyish（孩子气的）smile on his face. He had deliberately dropped the textbooks he was carrying onto his desk. “Good morning!”, he said still      . “I am glad to see everyone is awake. Now let’s get started. ”
For the next hour I wasn’t sleepy at all. It wasn’t from the      of my professor’s textbook alarm clock either. It was instead from the fascinating discussion he led. With knowledge and good      he made the material come alive. His insight was full of both wisdom and loving-kindness. And the enthusiasm and joy that he      with were contagious（有感染力的）. I       the classroom not only wide awake, but a little smarter and a little better as well.
I learned something far more important than not       in class that day too. I learned that if you are going to do something in this life，do it well，do it with       . What a wonderful place this would be if all of us did our work joyously and well. Don’t sleepwalk（梦游）your way through      then. Wake up! Let your love fill your work. Life is too       not to live it well.

C．complaining

C．interruption

D．determination