题目内容
The “single act” mentioned by the author was to choose vegetarian dishes every time one has a meal.
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A great many of Canadians have changed little by little from animal-based foods to vegetarian foods?
Vegetarian foods are sold very well, especially popular in India, China, Mexico, Italy and Japan.
理想运算放大器工作在线性区时有两个重要特点：一是差模输入电压 相同 ，称为 “ ”，二是输入电流 为零 ，称为 “ ”，如果U+或U-有一个接地，则称为“”。
正弦振荡电路的四个组成部分是：、、、。
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