肌激动器不适用于下列哪类错牙合 ()
A.安氏Ⅰ类牙列拥挤
B.安氏Ⅱ类1分类错牙合
C.安氏Ⅱ类2分类错牙合
D.安氏Ⅲ类错牙合
E.开牙合
参考答案:A
The letter he had been looking forward to________at last this morning.[ ]
A. come
B. comes
C. coming
D. came
易过期失效药品、疫苗的保管,要定期检查,按照“先进先出”和“失效期近的后出”