1. The numerical coefficients of similar projects must be the same. Is a proposition

2. There is a one-to-one correspondence between points on the number axis and real numbers. It is a proposition, and it is a true proposition.

3. For earthquake relief, unity is strength. It's not a proposition (you can't see the problem from the conclusion)

Diaoyu Island is an inalienable territory of China people. It is a proposition, and it is a true proposition.

20 12 China won the second gold medal in London Olympic Games. It is a proposition, and it is a true proposition.

The proposition should have two parts: the topic and the conclusion; In addition, the right proposition is true and the wrong proposition is false.