内因子与哪种维生素的吸收有关（）
A.维生素A
B.维生素C
C.维生素D
D.维生素E
E.维生素B12
参考答案：E
I'm not a little tired today after giving the room a thorough cleaning and I have never had
______ today. [ ]
A. as tiring a day as
B. as a tiring day
C. tiring as a day as
D. day as a tiring as
绝热工程保护层施工时，若遇设备变径，过渡段应采用()。
A．平板
B．波形板
C．软橡胶板
D．帆布
