属于环境外暴露水平测定的是
A.脏器系数B.血铅C.饮水中氟化物含量D.血中胆碱酯酶活性E.脂/水分配系数
参考答案:C
痰液定量培养多少可判定为致病菌()。
A.≥104cfu/ml
B.≥105cfu/ml
C.≥106cfu/ml
D.≥107cfu/ml
E.≥108cfu/ml
Passage One
Why is Thomas Jefferson mentioned in this passage a. As an example of interracial intimacy. b. Because he was a slave owner and was ply against interracial marriages. c. Because he was one of the early advocates of interracial marriages. d. Because he married a black woman.