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某电容器两端的电压为40V,它所带的电量是0.2C,若电容器两端的电压降到20V时,则( )
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花生叶是复叶
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在电路中引入电流串联负反馈后,与基本放大器的输入、输出电阻相比,加反馈后放大器的输入、输出电阻的变化是( )
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一个三级放大器,各级放大电路的输出阻抗分别是Ro1=100kΩ,Ro2=200kΩ,Ro3=300kΩ,则此多级放大电路的输出阻抗为( )
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测量三相异步电动机电流大小用( )
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He has made _____ progress this term than before.
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The girls asked _____ they took enough food and drink with them.
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Does Mike often play _____ table tennis after _____ school?
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The chair was broken, so he had to fix it up _____ a hammer.
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— Could you lend me an exercise book? — Of course. Here are two and you can take _____ of them.
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He left words with my father that he would come to support me in the convention and he kept his _____ .
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膀胱炎患者排出的新鲜尿液有( )。
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多尿是指24小时尿量超过( )。
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为右上肢骨折病人脱、穿衣服的正确方法是( )。
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长度为16cm的无菌持物镊,消毒液应该浸泡的长度至少为( )。
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_____ you don't lose heart, you will find a way to overcome the difficulty.
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_____ and then you will make greater progress.
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Look at the picture. The top five TV plays _____ in it.
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It is raining heavily outside and you ____ out now.
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Is _____ necessary to tell her mother everything?
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