【单选题】These experiences ______ me _____ the drug’s harmful effects.
【单选题】在总账系统中,删除凭证的必要条件是( )
【简答题】What happened to the items requested? The items requested have been ______.
【单选题】AIDS was first identified in 1981 among homosexual men and drug users in western Europe.
【单选题】What kind of items cannot be returned?
A.
Items that have been personalized
B.
Items damaged during shipping
C.
Items unaccompanied by an original receipt
D.
Items ordered more than a month ago
【多选题】以下能够影响硅在腐蚀液中发生电化学反应速度的因素包括______。