Obviously armoring layer existed in the surface of the river bed.
河床表面具有明显的粗化层。
The upper surface of the bed remains horizontal when the container is tipped.
当容器倾斜时床层上表面保持水平。
The cause of the surface cracks of a bolt bed was analyzed in this paper.
本文分析了飞机前襟翼作动筒连接螺栓底座表面裂纹的形成原因。
The cause of the surface cracks of a bolt bed was analyzed in this paper.
本文分析了飞机前襟翼作动筒连接螺栓底座表面裂纹的形成原因。
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