ISBN: 9787502053338 - 信号工 把钩工：初级 中级 煤炭工业职业技能鉴定指导中心 煤炭工业出版社 9787502053338 (1 resultados)

paperback. Condición: New. Language:Chinese.Paperback. Pub Date: 2016-11-01 Publisher: coal industry publishing house Book to bell man. put the hook national professional standards as the basis. respectively introduces the elementary. intermediate bell man and put the hook professional skill appraisal appraisal of knowledge and skill requirements.Basic knowledge including electricity. pliers. mine transportation knowledge. mine signal device and communication devices. electrical safety and the explosion of knowledge an.…