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Objective Research element composition of producing power in foundry work and quarry work.
调查研究某铸造作业和采石作业生产性粉尘成分的元素含量。
The element composition and the group content of lignin are different if it prepares by the different methods.
不同方法制备得到的木质素产品，元素组成及官能团含量是不同的。
The result showed that: the oil yield rate varies with the different element composition in each kind of sewage sludge.
结果表明：不同污泥由于其元素构成有所差别，其产油率亦有所不同。
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