To determine the AA has two methods:The first method: determines the AAA based on differential equation system specifications in (Equation 1) in combination with formula (2).This method has been studied in many different buildings and was widely [1]. The advantage of this method is highly accurate but expected.The second method: AAA determined without solving the mathematical art in, just need to know a number of characteristic quantities (such as the biggest pressure of the ammunition Chamber, velocity profile, ...). This method has the advantage is simple math but not by the first method. This is the modern method and the article will analyze this method carefully.
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