1. Rubber tube aging When the economy overheats and inflation rises, interest rates are raised and credit tightened. When the overheated economy and inflation are under control, the interest rate is duly lowered. Interest rates are therefore one of the fundamental economic factors. Interest rates are an important financial variable in economics, and almost all financial phenomena and financial assets have more or less connection with interest rates. Compression ratio refers to the ratio between the total volume of the cylinder and the volume of the combustion chamber, which indicates the degree of gas compression in the cylinder when the piston moves from the lower stop to the upper stop. Compression ratio is an important parameter to measure the performance of automobile engine. The deregistration of shares refers to the reduction of a part of the company's shares in accordance with the issuing procedure. The total write-off of the company's shares only occurs when the company is dissolved. In addition, through the buyback of shares and the merger of the company with the shares of the company, it can also achieve the purpose of the cancellation of shares