只通过粪便排出的病原体是()
A.水痘
B.脊髓灰质炎病毒
C.疟疾原虫
D.风疹
E.志贺菌属
参考答案:E
Let __ help ___.[ ]
A. they, you
B. us, his
C. me, them
D. we, you
缓释制剂可分为()
A.骨架分散型缓释制剂
B.缓释膜剂
C.缓释微囊剂
D.缓释乳剂
E.注射用缓释制剂