问题
填空题
要想得到持续的电流，电路中必须有 ，而且电路还必须是 的。
答案
电源 闭合
题目分析：电源是提供电压的装置，有电压才能有电流；电路是通路电路中才能有电流；得到持续电流的必要条件：有电源，电路是通路。
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要想得到持续的电流，电路中必须有 ，而且电路还必须是 的。
电源 闭合
题目分析：电源是提供电压的装置，有电压才能有电流；电路是通路电路中才能有电流；得到持续电流的必要条件：有电源，电路是通路。
On September 19 this year, you will see a full moon (满月). It is the Mid-Autumn Festival (中秋节).The festival is on the 15th day of the eighth lunar (农历) month. And it is one of the most important festivals in China. It is a big time for families and friends to get together. In the evening, people sit around a table and look at the bright moon. They eat sweet or salty moon cakes (月饼). People can see a lot of lanterns (灯笼) in the street. Children like guessing (猜) the answers to the lantern riddles (灯谜). The Mid-Autumn Festival is also a harvest (收获) festival. Farmers begin to harvest fruits and vegetables.
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