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4 godz. temu · It contains six tangential holes, each with a cross-sectional diameter of 1.7 mm, located 2 mm from the top cover; the contraction section angle is set at 45°; the equal diameter section has a length of 20.75 mm and a diameter of 5.4 mm, as shown in Figure 2a. The main feature of the expansion mouth model is the addition of an expansion mouth ...
