Subjective inquiry was used to investigated cleaning mode, smell and choice of attendants on trains with directly drained lavatory or sealed lavatory.
采用主观询问的方法对列车直排式和密闭式厕所的清扫方式，是否有臭味，以及对厕所排泄方式的选择进行了调查。
Subjective inquiry was used to investigated cleaning mode, smell and choice of attendants on trains with directly drained lavatory or sealed lavatory.
采用主观询问的方法对列车直排式和密闭式厕所的清扫方式，是否有臭味，以及对厕所排泄方式的选择进行了调查。
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