China's chemical output ranks first in the world

In 2010, China Chemical successfully surpassed the United States, and its total output ranks first in the world.
In 2010, the total output value of China's petroleum and chemical industries reached 8.82 trillion yuan, which was calculated at an average exchange rate and exceeded the t.......

What is an engine protection agent?

The failure of the engine is generally caused by wear. The friction consumption is generally caused by friction. It is the dream of every mechanical engineer to protect the engine forever. It is also the top research to.......