ISBN: 9787502118396 (1 résultats)

paperback. Etat : New. Paperback Pages Number: 361 Language: Chinese. In order to improve the quality of the stone workers. to meet the needs of the oil workers' training and assessment. the China National Petroleum Corporation. the Labour Bureau organization has prepared a set of labor skills and level of training materials. Oil workers 'level of training materials: water quality inspection work. according to the state issued the workers' technical grade standards and the head office of the Labour Bureau organizat.…