The functions of spleen don’t include
A. It provides a place for T and B cells to settle down
B. It can produce secretory IgA and mediates mucosal immunity
C. It provides a place for immune response
D. Hematopoiesis
E. Blood storage
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当一束白光通过()后,按照不同波长展开的现象,称为光的()。
视角即物体的大小与人眼所形成的() ,其大小与()和()有关。