1. The invention aims to solve problems in the prior compensation pulse generator, such as complicated electrical excitation structure and unadjustable permanent magnet excitation output.
   目的是解决现有补偿脉冲发电机电励磁结构复杂、永磁励磁输出不能调节问题。
2. For unadjustable ones, the exit may be the best choice.This paper also studied the relevant barrier, ways and policies.The last part can be viewed as a case discussion.
   而对不可调整升级型衰退产业本文则做出了退出的建议，并对退出的障碍、退出的方式及顺利退出的政策保障进行了论述。

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