机体缺乏抗体时,对细菌的调理吞噬作用可通过()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
可通过巨噬细胞吞噬作用将所载药物分布于作用部位的被动靶向制剂是( )。
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