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【简答题】
某实际电压源U S =12V,R 0 =2 W ,则负载电阻为 时获得最大功率,最大功率为 ,此时电源的输出功率为 。
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【简答题】发动机两大机构,发动机下面机构在点火时,气体燃烧膨胀做功,在一个工作循环中,活塞往复运动次。推动连杆带动曲轴旋转。
【单选题】Why did he buy it?
A.
It was very interesting.
B.
It was cheap.
C.
It was a good reading material for learning English.
【简答题】It was a quiet village in which there was a military camp. It was far from the towns and cities and there were some high mountains around. Of course it was a good place for training the new soldiers. ...
【简答题】It was a quiet village in which there was a military camp. It was far from the towns and cities and there were some high mountains around. Of course it was a good place for training the new soldiers. ...
【简答题】发动机两大机构,发动机下面机构在点火时,气体燃烧膨胀做功,在一个工作循环中,活塞往复运动_次?
【简答题】发动机两大机构,发动机在一个工作循环中,曲轴旋转通过皮带或链条,带动凸轮轴旋转____圈。
【简答题】A．They believed it was a gift from the gods. B．They believed it was a warning from outside world. C．They believed it was a sign of misfortune. D．They believed it was a trouble- property.
【简答题】发动机两大机构,发动机下面机构在点火时,气体燃烧膨胀做功,在一个工作循环中,连杆带动曲轴旋转____圈。
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