小量无菌制剂制备时，哪种方法被普遍采用，为无菌操作创造丁良好的条件
A．空调系统
B．室外
C．风扇
D．加湿气
E．层流洁净工作台
参考答案：E
Up to now there has been a ____ online about whether or not life on the earth will be at an end in natural
disasters such as earthquakes and floods. [ ]
A. failure
B. focus
C. battle
D. bond
间接盖髓术（）
A.年轻恒牙早期急性牙髓炎
B.年轻恒牙牙髓充血
C.年轻恒牙晚期牙髓炎
D.乳牙牙髓坏死
E.年轻恒牙根尖周病
