单项选择题
A.50ml B.100ml C.150ml D.200ml E.250ml
A.肝 B.脾 C.骨髓 D.淋巴结 E.卵黄囊
A.4~6天,4~6月 B.4~6周,4~6岁 C.4~6天,4~6岁 D.4~6月,4~6岁 E.4~6周,7~8岁