2011 national registered safety engineer qualification examination questions six six analog: safety management knowledge [paperback](Chinese Edition)

by JIAN ZHU KAO SHI PEI XUN YAN JIU ZHONG XIN Paperback details (USA). ISBN: 978-7-113-12599-8 ISBN-10: 7-113-12599-9 China Railway Publishing House; 1 ( April 1. 2011) · 2007