将加速段、减速段高度及其管径比作为可变参数，建立了结构优化数学模型。
Set the height of accelerating section and decelerating section, ratio of pipe-diameter as alterable parameter, the mathematic model of structure optimization was established.
第二段为变频器减速段，一般第一段小于第二段1 - - - 2米。例如；复卷长度每卷为50米。
The second par is the decelerating section of transducer, generally, the second part is one-two meters longer than the first part. for example, each rewinding part is 50meters.
如同那些由于看到车祸而减速但在后来又提速的司机，投资者在危机后的一段时间会变得十分谨慎，但这段谨慎期往往不超过10年，之后，投资者又会变得冒进了。
Like drivers who slow down after seeing a crash but soon speed up again, investors exercise greater caution after a disaster, but these days it takes less than a decade to make them reckless again.
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