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【单选题】
碘解磷定治疗有机磷酸酯农药中毒的主要机制是A.
与磷酰化胆碱酯酶结合，使酶复活
B.
与胆碱酯酶酶结合，使酶功能增强
C.
与胆碱受体结合，使受体不能激动
D.
与老化的胆碱酯酶结合，使酶复活
E.
与乙酰胆碱结合，阻止作用与受体
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举一反三
【单选题】I wish you ___ such a headache because I’m sure you would have enjoyed the concert.
A.
hadn’t
B.
didn’t have had
C.
hadn’t had
D.
hadn’t have
【单选题】I wish you ______me how to make such a sauce last time.
A.
teach
B.
taught
C.
have taught
D.
had taught
【单选题】---- You have never seen an American film, have you? ---- ________. How I wish I had such a chance!
A.
Yes, I have
B.
Yes, I haven’t
C.
No, I have
D.
No, I haven’t
【单选题】I wish that you_____such a bad headache because I'm sure that you would have enjoyed the concert.
A.
hadn' t
B.
didn' t have had
C.
hadn' t had
D.
hadn' t have
【单选题】I wish you ______ such a great deal of fuss.
A.
were not caused
B.
had not caused
C.
have not caused
D.
are not caused
【简答题】简述发动机低温起动困难的主要原因有哪些?
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