The submarines
Posted: Sun Dec 28, 2014 5:56 pm
Hi
My topic is about the submarines and my question is : How and why the submarine float and sink. I did some researches but my problem is that I have some difficulties to make my hypothesis ?
My topic is about the submarines and my question is : How and why the submarine float and sink. I did some researches but my problem is that I have some difficulties to make my hypothesis ?