问题
选择题
| 如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（ ） A．5 B．5A C．3.5 D．3.5A  |
答案
答案：B
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| 如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（ ） A．5 B．5A C．3.5 D．3.5A |
答案：B
| 阅读，选择相应的词填入横线上。 | |
Edy: Mum, ① (鸡肉) is yummy. I would like some. I would like some ② (米饭), some ③ (牛肉) and some ④ (冰淇凌) too. Mom: Don't eat so much! You are very fat, now. Edy: All right. Can I drink some ⑤ (水)? Mom: Certainly. |