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In a time of low academic achievement by children in the United States,many Americans are turning t...

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heavy carbon deposits will buildup on the valves and in the exhaust  fuel dilution is increased at low load  exhaust valves may be damaged  all of the above  
ACh释放增加  ACh与ACh门控通道结合能力增高  胆碱酯酶数量减少  胆碱酯酶活性降低  终板膜上 ACh门控通道功能增强  
直接兴奋神经节,ACh释放增加  促进ACh的合成  胆碱酯酶活性下降,ACh水解减少  胆碱能神经活性增强,ACh释放增加  以上全部正确  
I will finish  had finished   have finished  I will have finished  
Ach  5-羟色胺  去甲肾上腺素和Ach  去甲肾上腺素  去甲肾上腺素或Ach  
直接作用于受体  影响ACh的释放  影响ACh的生物合成  影响ACh的代谢  影响ACh的贮存  
胆碱能神经活性增强,ACh释放增加  胆碱酯酶活性下降,ACh水解减少  直接兴奋神经节,ACh释放增加  胆碱乙酰化酶活性增强,促进ACh的合成  突触前膜重摄取活性增强,ACh堆积  
that he is in low spirits    which he is in low spirits    when he is in low spirits    then he is in low spirits  
that he is in low spirits    which he is in low spirits    when he is in low spirits    then he is in low spirits  
不释放ACh  少量囊泡随机释放ACh  大量囊泡量子式释放 ACh  大量囊泡交替释放 ACh  大量合成及储存ACh  
多巴胺含量下降,ACh含量增加  多巴胺含量增加,ACh含量增加  多巴胺含量下降,ACh含量下降。  多巴胺含量增加,ACh含量下降  多巴胺含量不变,ACh含量下降  
多巴胺含量下降,ACh含量增加  多巴胺含量下降,ACh含量下降  多巴胺含量增加,ACh含量增加  多巴胺含量增加,ACh含量下降  
heaven never helps the man who will not act    he who makes constant complaint gets little compassion    hope for the best, but prepare for the worst    It is easy to be wise after the event  

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