Output the class header, including import statements and boiler-plate comment.
输出类头，包括导入语句和注释。
Most of prepress dept output the plate, they would not know the plate would be printed by which press.
大多数印前部门输出印版时并不知道该印版在哪台印刷机上印刷。
The output and quality of metal plate and strip are heavily affected by electromechanical vibration in rolling process.
轧钢过程中的负荷扰动容易激起机电振动，这严重影响板带材的产量和质量。
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