分泌型IgA主要产生部位
A.淋巴结B.脾脏C.骨髓D.外周血E.黏膜相关淋巴组织
参考答案:E
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On a __( )__ memory system,the logical memory space available to the program is totally independent of the physical memory space.
A.cache
B.virtual
C.RAM
D.ROM