Methods A retrospective study of pneumoconiosis inci dence in 11 factories and mines and 1 area(Liaoning Province) by unified design was carried out.

 
  • 方法 按統一設計方案,對11個(gè)廠(chǎng)礦和1個(gè)綜合性地區(遼寧省)的塵肺發(fā)病情況進(jìn)行回顧性調查。
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