In Syria it is shown on a seal from the Mitanni civilization (c. 1450-1360 BC).
在叙利亚,它表现为一个从密坦尼文明而来的图章(C . 1450—公元前1360)。
Structure and principle, failure reason and harm of compressor floating ring seal, and measures which prevented the seal from failing are introduced.
叙述了离心压缩机浮环密封的结构、原理、浮环密封失效的原因和危害,以及防止密封失效应采取的措施。
Sofus the Harbour Seal from the Blue Reef Aquarium in Tynemouth is having his teeth cleaned in preparation for an operation to have a broken tooth removed.
泰因茅斯蓝礁水族馆的斑海豹索菲斯正在刷牙,为拔掉坏牙做准备。
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