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从实验室筛选出的７种护耳器，经９９名钻井工人现场使用作了主观评价。通过现场工人噪声防护效果的评价，推选出４种护耳器作为石油勘探工人首先使用的个人防护用品。
Seven kinds of ear protection devices selected from the laboratory were subjectively evaluated by 99 drilling workers on site. Through the evaluation of noise protection effect of field workers, four kinds of ear protection devices were selected as the personal protective equipment firstly used by oil exploration workers.