问题
单项选择题
半数有效量(ED50)是
A．引起50%动物死亡的剂量
B．引起50%动物中毒的剂量
C．引起50%动物产生阳性反应的剂量
D．和50%受体结合的剂量
E．达到50%有效血药浓度的剂量
答案
参考答案：C
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半数有效量(ED50)是
A．引起50%动物死亡的剂量
B．引起50%动物中毒的剂量
C．引起50%动物产生阳性反应的剂量
D．和50%受体结合的剂量
E．达到50%有效血药浓度的剂量
参考答案：C
cooking food in the bush and sleeping in tents. But they’re the exciting 小题2:__________ that I enjoyed most. One of the activities was 小题3:__________ Flying Fox. 小题4:__________ you are taking part in the activity, you are attached to a wire that stretches from the top of a cliff to the ground. Then you jump off the cliff. There are very strong ropes and clips so you are very safe. Before I went on the Flying Fox, I was a bit 小题5:__________. My classmates kept on encouraging me. So I closed my eyes and jumped. I felt my whole body was flying! It was so exciting! |