该型泵具有真空度高、结构简单，使用方便、工作可靠、维护方便的特点。
The vacuum-type pump with a high, simple structure, easy to use, reliable, easy maintenance features.
本文对一大型船厂钢结构厂房的墙架系统设计进行了简单介绍。
The design of wall frame system in large- scale steel shipyard building is introduced.
BL型搅拌机结构简单，操作方便；
Model BL blender's structure is simple, operation is convenient;
BL型搅拌机结构简单，操作方便；
Model BL blender's structure is simple, operation is convenient;
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