“川气东送”是我国继“西气东输”工程后又一项天然气远距离管网输送工程。下图为“川气东送”工程干线分布及长江部分水电站分布示意图，读图完成下列各题。

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    Apple Inc.'s iPhones may be the most popular mobiles in the world now. Not only adults use them,but little children also like them.

    Natasha Shykes is a mother of two kids in America.When her daughter, Kelsey, was only two years old, she became interested in her father's iPhone. “She pressed the button (按钮) and the phone lit up.It seemed to be amazing for her,” said Natasha. “Then she got serious about the phone. She always cried for it. It seemed that she also wanted an iPhone.”

    Apple Inc.'s iPhones are easy to use. So it is not difficult for little children to use them.Many applications (应用软件) on iPhones are designed for children who are too young to go to school. For example, children can learn more about the animals in the world by watching the videos on the phones.

    However, parents are very worried about this. They don't know whether they should buy their children iPhones or not. There are two main reasons. One is that they are afraid that children may destroy the iphones. Another reason is that they are not sure whether iPhones can really be used as educational tools.

125×12.5×1.25×8×8×8积的末尾有（　　）个零．

非空集合G关于运算⊕满足：

（1）对任意a，b∈G，都有a+b∈G；

（2）存在e∈G使得对于一切a∈G都有a⊕e=e⊕a=a，

则称G是关于运算⊕的融洽集，

现有下列集合与运算：

①G是非负整数集，⊕：实数的加法；

②G是偶数集，⊕：实数的乘法；

③G是所有二次三项式构成的集合，⊕：多项式的乘法；

④G={x|x=a+b $\sqrt{2}$ ，a，b∈Q}，⊕：实数的乘法；

其中属于融洽集的是____（请填写编号）