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。
Objective Research element composition of producing power in foundry work and quarry work.
用扫描电子显微镜和X射线能量色散仪测定某铸造作业翻砂车间、造型车间、清砂车间和某采石作业生产性粉尘粒子的结构及各元素的百分含量。
Methods Scanning electron microscope and X-ray analysis were used to study the distribution of all kinds of elements in sand-cast, sculpt and clear-sand of one foundry work and quarry work.
本单元组主管监督和协调从事地下和地表采矿作业和采石场工人的活动。
Supervisors in this unit group supervise and co-ordinate activities of workers engaged in underground and surface mining operations and quarries.
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