问题
填空题
电源内部，非静电力把正电荷从______极移到______极，因此带正电的极板是电源的______极，带负电的极板是电源的______极．
答案
电源之所以能维持外电路中稳定的电流，是因为它有能力把来到负极的正电荷经过电源内部不断地搬运到正极．从而使正极板带正电，为电源的正极，负极板带负电，为电源的负极
故答案为：负 正 正 负
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电源内部，非静电力把正电荷从______极移到______极，因此带正电的极板是电源的______极，带负电的极板是电源的______极．
电源之所以能维持外电路中稳定的电流，是因为它有能力把来到负极的正电荷经过电源内部不断地搬运到正极．从而使正极板带正电，为电源的正极，负极板带负电，为电源的负极
故答案为：负 正 正 负
| 请阅读下面一篇文章,并按照要求匹配信息。 | |
| Keep safe in storms In the spring and summer months, thunderstorms (雷雨) are common. 1 In thunderstorms, lightning can strike (击中) people and buildings and is very dangerous. It was reported that a man was struck by lightning when he was making a phone call under a tree. He died at once. You may not know it, but nearly 1,800 thunderstorms are happening at any moment around the world. 2 So what should you do during a lightning storm? Scientists say that a person's chances of being struck by lightning are 1 in 600,000. 3 If you are indoors during a thunderstorm: ＊Stay away from anything that is metal because lightning can come into the house through it. ＊Don't stand near the windows. ＊Don't take a shower or bath. Lightning can travel through water. ＊Never use the phone. 4 If you are caught in a thunderstorm outdoors: ＊ 5 If there's no building around, try to find a low place to stay in. ＊Do not go under a tree because the lightning could hit the tree and travel through the tree to hit you. ＊Never use a cellphone. | |
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