苯巴比妥的乙醇溶液澄清度检查物质是（）
A．苯丙二酰脲
B．酸性杂质
C．2-苯基丁酰胺
D．对氨基酚
E．苯基丁酰脲
参考答案：A
— Do you think the weather is good enough for an outing?
— Yes, you couldn't hope for _____ at the time of the year. [ ]
A. a nice day
B. the nicer day
C. a nicer day
D. the nicest day
发电机出口PT熔断后有何危害？
