The tube is graduated so that flow rate can be read directly on a linear scale.
管子上刻以标度，以便在线性标度上可以直接读出流动速率的数值。
Fix the controller at the required height in the graduated guide-tube; and press the control screw, the cylinder will fall on the indenter and then transfer the impact on the film panel.
用控制器螺钉固定好高度，按压控制螺钉，重锤即自由落在冲杆上，冲杆将冲击力传到样板上。
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