吸收维生素B.12所需的内因子来自？（）
A.主细胞
B.颈粘液细胞
C.胃小凹上皮细胞
D.壁细胞
E.胃内分泌细胞
参考答案：D
Only my cousin has chosen to apply for a job in Africa ________ the majority of this year's graduates working in Britain.
A．in common with
B．as well as
C．in contrast to
D．by reason of
简述零件的形位误差合格性条件？
