Air that has become saturated with harmful chemic als , carbon monoxides , dust , and other contaminants .
充满有害化学物质、一氧化碳、灰尘和其它有害物质的空气。
By means of analysising the chemic component , optical structure and the sem and measuring the microhardness , the samples with the crack in the hardface layer of continuous caster roller were studied .
The research and development of xanthoceras sorbifolia bunge including propagation technology , breeding , physiological research and chemic component were reviewed . At the end the research deficiency in xanthoceras sorbifolia bunge was put forward .