In this important new book， children will discover not only what hydrogen is， but also how this simple element can create clean energy， as well exploring it's past dealings with hot air balloons and airships， its present， space shuttles and fuel cells.In this important new book， children will discover not only what hydrogen is， but also how this simple element can create clean energy， as well exploring it's past dealings with hot air balloons and airships， its present， space shuttles and fuel cells.
1家庭擁有
0條書(shū)評(píng)筆記
