特别重大事故的调查期限为()。
A.30日
B.60日
C.80日
D.100日
参考答案:B
筒箭毒碱在临床上可用于( )
A.重症肌无力 B.严重休克患者C.哮喘 D.手术时与麻醉药合用
New ideas and values took the place of those _______ in the Middle Ages. [ ]
A. held
B. having held
C. being held
D. holding