哪一种维生素在吸收过程中需要胃粘膜分泌的内因子协助()
A.维生素E
B.维生素D
C.维生素C
D.维生素B12
E.维生素B6
参考答案:D
The old lady has a _______ time _______ clothes every day.
A.difficulty; to wash
B.difficulty; washing
C.difficult; to wash
D.difficult; washing
护理质量标准规定,对手术室医护人员的手进行微生物监测的周期是( )
A.每周 B.每月C.每天 D.每2周