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【判断题】
我国普通线路钢轨的标准长度为12.5m和25m这2种,对于38kg/m、43kg/m、50kg/m、60kg/m、75kg/m五种钢轨都有这2种长度。A.
正确
B.
错误
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【简答题】用所给词的适当形式填空。 1. The lake is a very erous place for young children. Of course I don't allow anyone _____( swim). 2. We don't permit _____(play) basketball on the playground between six and ten in...
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【简答题】如图所示，平行板电容器由面积S=2m 2 的两个平行导体板A、B组成。两板放在空气中，相距为d=1cm，充电到△V=100V后与电源断开，再放入一平行等面积的导体板C，距A、B板分别为2mm和6mm，并将C板接地。
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【简答题】如图所示，平行板电容器由面积S=2 m2的两个平行导体板A、B组成。两板放在空气中，相距为d=1 cm，充电到△V=100 V后与电源断开，再放入一平行等面积的导体板C，距A、B板分别为2 mm和6 mm，并将C板接地。试求： (1)放入C板后，A、B板间的电势差； (2)用一导线将A、B板连接，此时A、B板与C板间的电势差。
【简答题】用所给词的适当形式填空 We eat vegetables with every meal because we love (they)_____.
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