题目内容
机筒和螺杆共同组成了挤压机的挤压系统 ，完成对物料的固体输送、熔融和定压定量输送作用。
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挤压机的加热冷却系统多是分段设置的。
目前大部分双螺杆挤压机采用同向旋转。
Complete the following statements according to what you have heard.1. According to Dr. Hertz, to his grandparents the American Dream first meant getting out of ___________; later it comes to mean the chance _____________.
In Dr. Hertz's opinion, _________________wants people to believe in the American Dream because it tends to use the American Dream to keep most of its population working and spending their money so as to ______________________.
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