The PLA Navy will need to overcome several large obstacles before it can field an operational aircraft carrier and associated supporting ships.
海军将需要克服一些障碍，才能场大型航空母舰及相关业务辅助舰艇。
The breaking strength of PTT and PLA fibers decreased after ultrasound radiation, but the degree of strength lost not large and still meet the need of fibers.
超声波处理对纤维热性能影响不大，使PTT及PLA纤维断裂强力有所下降，但下降程度不大，不影响纤维使用要求。
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