[衛(wèi)生法規(guī)]維生素B

原題:
[衛(wèi)生法規(guī)]維生素B

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甲乙兩工廠某工種某病患病率如下，應(yīng)該如何比較兩工廠的患病率
A.選定一個(gè)該工種的標(biāo)準(zhǔn)患病率
B.直接法標(biāo)化
C.間接法標(biāo)化
D.無法比較
E.以上都不是
答案：
B

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