Noise wave investigation in the field is an important means for determining optimum field parameters, and it causes direct influence on the quality of data acquisition.
野外干扰波调查是指导正确选择野外采集参数的重要手段，直接影响采集数据的质量。
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Methods a hygienic investigation of workplaces was carried out in oceangoing vessel, and the results of hearing examination in 1 663 noise exposed mariners were compared with controls.
RESULTS In this investigation the items of some priority department can′t catch the standard level such as total bacteria number, relative humidity and noise.