A.医学上用于消毒的酒精是75%酒精溶液
B.乙醇可作为提取碘水中碘的萃取剂
C.食醋是含3%~5%乙酸的溶液
D.乙醇的俗名叫酒精
答案:B
Without plenty of oral practice,you’ll find it hard to ______a conversation with native English speakers.
A.go on
B.carry on
C.carry out
D.work on
现金流量法要求折现率既包含安全收益部分,又包含风险收益部分。