服皂水对清洁物刺激性较小,可适用于清洁大理石地面。
参考答案:错
自身免疫性胃炎患者出现恶性贫血是由于血中有抗内因子抗体存在而影响()
A.维生素C的吸收
B.维生素C的降解
C.维生素B12的吸收
D.维生素B12的降解
E.维生素K的吸收
Either his wife or his friends __________ his birthday party.
A.has attended
B.have attended
C.attends
D.is attending