求一道积分解过程,用e^(-x)做换元

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

请帮忙给出正确答案和分析，谢谢！

用于病毒性肝炎治疗的是

A.抗毒素

B.减毒疫苗

C.IFN-a

D.造血干细胞移植

E.免疫抑制剂

请帮忙给出正确答案和分析，谢谢！

Which of the following sentence is NOT an elliptical sentence(省略句)？

A．I want to improve my French but I don"t know how.

B．Some of the answers were correct while I don"t know which.

C．This is what I want to say and I hope that you can follow me.

D．I touched the door to see if the dirt on it could be eliminated, and it surely could.

请帮忙给出正确答案和分析，谢谢！

Which of the following sentence is an elliptical sentence(省略句)？

A．On the top of the trees were some birds.

B．The police found a large box under his bed, in which were so many tools.

C．He didn"t sell half as many apples as he thought he would.

D．I can"t remember which city he comes from.

请帮忙给出正确答案和分析，谢谢！

Their rival company is planning a______ takeover.

A．vicious

B．spiteful

C．hostile

D．mean

请帮忙给出正确答案和分析，谢谢！