Objective to study and determine the appropriate air flow rate of a positive pressure respiratory protectivehood.
目的研究并确定一种正压呼吸防护头罩合适的送风量。
2
The protective cap or hood covering the spore case of a mossor related plant.
藓帽盖在苔藓或相关植物芽孢体上的保护帽或盖子。
3
This paper introduces the raw materials, formulation, preparative course and application method about PVA protective film in the range hood of household oil-smoke drawing machine.