某石英粉廠100例矽肺的發(fā)病工齡分布如表所示:
與全國塵肺流行病學(xué)調(diào)查總的結(jié)果相比,該廠矽肺發(fā)病的潛伏期
()
A.長
B.短
C.相等
D.大致相等
E.不能比較
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