高孔率泡沫状MnO2催化材料的制备及其催化性能 关键词：催化剂工程；高孔率；泡沫状MnO ；催化性能 [gap=1053]Key words：catalyst engineering；high porosity；foamed MnO2；catalytic properties
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破坏性还是很明显的：高失业率、上百万因抵押而无法回收的房屋和千疮百孔的公共财政。
There is obvious damage: high unemployment, millions of foreclosed homes and a huge hole in the public finances.
采用金刚石铰刀加工阀孔，生产率高，刀具寿命长，表面粗糙度低。
The machining of valve bore with diamond reamer features high productivity, long service life of reamer and lower surface roughness.
因此，利用锯末具有高发热量与烧失量的特点，将锯末作为造孔剂制备轻质高强高孔洞率的烧结制品。
Therefore, sawdust, as a pore-forming agent, can prepare sintered product with light weight, high strength and high porosity due to calorific value and loss of sawdust.
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