1. With a special made spinnerette, hollow pitch fibers were welt and spun, the basic design principals of this spinnerette were discussed in this work.
用自行设计的喷丝板，在单孔纺丝机上纺得了中空沥青纤维，文中讨论了这种喷丝板的设计原理。
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2. With a special made spinnerette, hollow pitch fibers were welt and spun, the basic design principals of this spinnerette were discussed in this work.
