求一道积分解过程,用e^(-x)做换元

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• 2下列具有致畸胎作用的抗癫痫药物是A、苯妥英钠B、苯巴比妥C、卡马西平D、地西泮E、乙琥胺

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• 3数学题目帮帮忙!积分多多!AB两地相距420千米,一辆汽车从A地开出,5小时后行了全程的4分之3,再
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• 4用于病毒性肝炎治疗的是A.抗毒素B.减毒疫苗C.IFN－aD.造血干细胞移植E.免疫抑制剂

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• 7复变函数与积分问题!答案说Z=0 是函数的可取奇点!这个不是二级极点么?
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• 8Which of the following sentence is an elliptical sentence（省略句)？A．On the top of the tree

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• 10Their rival company is planning a______ takeover.A．viciousB．spitefulC．hostileD．mean

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