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电源的电动势为4.5V,外电阻为R1=4Ω时,路端电压为4V.求:

上一题 下一题 0.0难度 选择题 更新时间:2016-08-09 12:11:24

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同类题1

下列图形是中心对称图形的是(  )

同类题2

   George was head of an African country. He was going to pay a visit to the USA. He decided to learn some English words so that he might greet Bill Clinton, president of the USA then, in English. So he asked his wife for help because she knew a little English. His wife told, “When you meet Mr. President, just greet him with “How are you”, and he may answer ‘I am fine’. Then you need only to say ‘Me, too’, and leave the rest to your interpreter(口译).”

    When his plane landed at the airport, George said to the smiling Clinton, “Who are you?”. This was quite unexpected to the president and surprised him greatly. But he quickly calmed() down. Still with a smile on his face, he answered, “I am Hillary’s husband.” To his reply, George answered back without a moment “Me, too”, and looked at the president’s wife, Hillary, smiling sweetly as well.

根据短文内容判断正误,正确的A,错误的B。

同类题3

设f(x)=2x-2,x≤2log2x-1,x>2,则f(f(5))=____

同类题4

在△ABC中,内角A,B,C的对边分别为a,b,c。若bsinA=acosB,则B=(   )

同类题5

计算
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