海员是一个特殊的职业群体,主要从事航海业,他们要经受许多与常人不同的复杂因素的影响,如海洋环境,水文和气象变化复杂,湿度大,风浪多,船舶的机动性大,在航时间长,常在短时间内航行在不同的海域,船舶环境固定,空间狭小,有噪声、振 Seafarers are a special occupational group, mainly engaged in the maritime industry. They are subject to many different complex factors such as the marine environment, complex hydrological and meteorological changes, high humidity, heavy storms and large ship maneuvers. A long time, often in a short period of navigation in different sea areas, the ship fixed environment, space is small, noisy, vibration