问题
多项选择题
关于剂量－反应关系评价，正确的是（）。
A.是定量危险度评价的第一步
B.确定特定接触剂量下评价人群危险度的基准值
C.主要是基于人群流行病学的结果
D.主要内容为建立由高剂量向低剂量、由动物效应向人的危险度外推的方法
E.可分为阈值化学毒物和无阈值化学毒物的剂量－反应关系评价
答案
参考答案：A, B, D, E
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关于剂量－反应关系评价，正确的是（）。
A.是定量危险度评价的第一步
B.确定特定接触剂量下评价人群危险度的基准值
C.主要是基于人群流行病学的结果
D.主要内容为建立由高剂量向低剂量、由动物效应向人的危险度外推的方法
E.可分为阈值化学毒物和无阈值化学毒物的剂量－反应关系评价
参考答案：A, B, D, E
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| June was lying by the Olympic size swimming pool in her new swimsuit. She was really hot and dived into the water. 1 else was in the pool. The refreshing water cooled her body immediately, which 2 her to continue doing some laps there. Not having swum in the past several years and being a bit out of 3 , June began to tire 4 ."Ah, no pains, no gains," June thought to herself. June 5 to swim, realizing her head was 6 . Breathing became 7 . Her sight wasn't so 8 . She saw the lifeguard and a couple others around the pool. She did not want to bother anyone. She continued. She found 9 in the middle of the pool. Deciding not to ask for help, she continued to swim. 10 , she made it to the other side of the pool. Sickness, weakness and exhaustion(精疲力竭) 11 it difficult for June to get out of the pool. 12 she stood, her body slowly shook back and forth, losing her 13 . Realizing she needed help but 14 to even say anything, she 15 the pool side and stood there. Several minutes later she had enough energy to only pull her body up out of the pool. 16 at the side of the pool with her feet in the water she felt that someone was 17 at her. It was the 18 . June was just able to 19 her hand, telling him she was okay. Have you ever found yourself in a(n) 20 where you're in trouble and you don't ask for help? There is nothing wrong in asking for help. June could have drowned. However, we all have the tendency, as June did. | ||||
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