干热灭菌法规定180~200℃灭菌需
A.2h~4h
B.0.5h~1h
C.3h~5h
D.1h~2h
E.3h~4h
参考答案:B
—Will people live to be 300 years old? — ______________.
A.No, they aren’t
B.No, they won’t
C.No, they don’t
D.No, they can’t
非水滴定法测定盐酸丁卡因含量时,必须加入的试液是
A.高氯酸滴定液(0.1mol/
B.结晶紫指示液
C.醋酸汞试液
D.冰酸酸
E.醋酐