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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. free hp porduct keys for windows 7 home pre,download key windows 7 professional 64 bit   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. free hp porduct keys for windows 7 home pre,download key windows 7 professional 64 bit   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.