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Mathematical analysis Yan ziqian
There are some side effects, but they are very small, so you can use them safely. I bought pd- 1 through "Hangzhou Wuzhou" before, and there was no adverse reaction after using it. This company is not very good, you can consult if necessary, ("Hangzhou Wuzhou" 400- 150-8089).

When system files are destroyed, such as KERNEL32.DLL under windowsdows2K, fonts under windowsdows98FONTS directory and other basic files when the system is running, because there is no way to complete initialization, the system will be forced to restart when it is started. You can do an experiment and try to rename the fonts in the windowsdows98 directory. When you turn on the computer again, our computer will turn on again and again.