However, because the method is synchronized, you pay the cost of synchronization for every invocation of the method, even though it is only required on the first invocation.

At first, it analyzes the main idea, characteristic and the action method of the advanced production mode, brief introduce the effect to the management by promoting quality level and decreasing cost.

Based on cost method of calculating reserves value, this paper puts forward value evaluating model of natural gas reserves (excess income general model) for the first time.