Dictation-U1.mp3: Write down the whole passage according to what you have heard. The passage will be read four times. The first and the last reading will be read at normal speed. The second and third reading will be read sentence by sentence.
【简答题】(10分)将洁净的金属片Fe、Zn 、A、B 分别与Cu用导线连结浸在合适的电解质溶液里。实验并记录电压指针的移动方向和电压表的读数如下表所示: 金属 电子流动方向 电压/V Fe Fe → Cu +0.78 Zn Zn → Cu +1.10 A Cu → A -0.15 B B → Cu +0.3 根据以上实验记录,完成以下填空: (1)构成两电极的金属活动性相差越大,电...