如图所示的闭合电路中，ab导线静止．当蹄形磁铁沿水平方向向右运动时，灵敏电流计的指针____（选填“会偏转“或“不偏转“）；若磁铁运动方向不变，只对调____，就可以改变感应电流的方向．

阅读下列短文，从每小题的三个选项中选出最佳选项。B
    Water comes from the sea, the rain and the tap. Animals, plants and human beings all need water. It is important for our daily (日常的）life. We use water to wash clothes and vegetables. We use water to cook food, make drinks, wash our face and so on. Firemen use water to put out fires. Fanners use water to grow crops. Water is useful. We mustn't waste (浪费）water. We must save water. Turn off the tap when you are brushing your teeth. Don't take a shower too long. Use the same water many times.

一Could you tell me         to get to Bright Bank?

    一Take the second turning on the right．It’s near there．

   

一队卡车运一批货物，若每辆卡车装7吨货物，则剩余10吨货物装不完；若每辆卡车装8吨货物，则最后一辆卡车只装3吨货物就装完了这批货物，那么这批货物共有____吨．

如图所示，在密闭容器内可移动活塞K的两侧分别充入空气(已知空气体积占整个容器容积的1/4) 和H₂、O₂的混合气体，在标准状况下，若将H₂、O₂的混合气体点燃引爆，活塞先左弹，恢复到原温度后，活塞右滑停留于容器的中央，则原来H₂和O₂的体积比可能最接近于(     )