单项选择题

小肠的pH值约为

A．7-8
B．5-7
C．2-3
D．4-5

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单项选择题

可表达高亲和力FcεRⅠ的细胞是
A、中性粒细胞、肥大细胞
B、单核细胞、巨噬细胞
C、中性粒细胞、嗜碱性粒细胞
D、肥大细胞、嗜碱性粒细胞
E、嗜中性粒细胞、嗜碱性粒细胞

4. An important shift in thinking will take place when enterprises enter the advanced stage of internationalization, where they no longer simply divide the markets they enter into into domestic and foreign markets, but see the domestic market only as a national market.

答案：正确