问题
判断题
理想电压源的外特性曲线是一条水平的直线。
答案
参考答案：对
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理想电压源的外特性曲线是一条水平的直线。
参考答案：对
| 根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。 | |
in a blue 1_______ is good for the mind and body. Blue can 2_______ mean sadness. Someone who is feeling sad may say "I'm feeling blue." Some colors make us feel happy. Orange is such a happy color. It can bring you happiness and cheer you up when you are sad. If you feel 3_______ or weak, please wear colors that make you feel energetic. Green can give you energy, because it 4_______ new life. And you can also wear red. That makes it easier 5_______ you to take action. |