The structure and mechanical properties of silica sponge spicule found in China Bo-hai were studied.

研究了我国渤海海域发现的一种硅质海绵骨针的结构和力学性能。

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It was important to select replacement bulls of 18-month-old based on their growth and development and progeny testing in bo-hai Black Cattle.

根据生长发育和后裔性能测定选择18月龄后备种牛是渤海黑牛选择的重点。

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A city of northeast China on the Gulf of Bo Hai east of Beijing. It was formerly a treaty port. Population, 300, 000.

秦皇岛中国东北部一城市，位于渤海湾沿岸、北京的东面，它以前是一个通商口岸，人口300。

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