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在亚声速流动时，管道截面缩小，气流速度（）
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驱动液压泵的电机功率应比液压泵的输出功率大,是因为()。
Chinese rules of etiquette regarding costumes and adornments started taking shape in the______ dynasty, regulating from nobles down to commoners.
_____ had been used in the front of costumes for several thousand years before the Ming dynasty.
The four most famous types of embroidery in China are Sichuan embroidery, Suzhou embroidery, Hunan embroidery and _______ embroidery.
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