Pre-Employment Medical Examination (Protection and Indemnity Club requirement for ship operators and owners)劳工体格检查(保护和赔偿要求经营者和船舶俱乐部所有者) persistent effusions of the middle ear中耳持续渗液 Pakistan Electrical and Mechanical Engineers巴基斯坦电气和机械工程师 Peterborough Electrical and Mechanical Engineering彼得堡机电工程