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571 standard, the Netherlands according to a pitiful, almost crippled breaking six years of painstaking research data in the design of the submarine they finally appear, not as U571, but in addition to the individual technology is basically a whole succession of Germany before World War II quite a submarine launched, that is, just follow this standard to create a submarine, basically you can guarantee Alaska submarines in the next ten years will be the number two very advanced submarines. activate windows 7 ultimate,7 windows ultimate download   I remember a maple leaf after the submarine tonnage on prewar Has nearly one thousand tons, a length of more than 60 meters, speed seems faster, but actual combat, these submarines have a lot of deficiencies, dive deep enough, dive fast enough, poor endurance, snorkeling time is not long, and so wrong, also cause submarine status is not high. activate windows 7 ultimate,7 windows ultimate download   So practicality is not high for such submarines, the maple leaf has been no thought to build, a sheer waste of money, to create build the best, but also to ensure that at least ten years will not be behind bars.