确定硅酸盐水泥中的石膏掺入量时首先应考虑()。
A.熟料中C3A和R2O的含量
B.熟料中SO3含量
C.水泥中混合材掺入量
参考答案:A
女婴,1岁。重度营养不良。治疗时,每日开始供给的热量应是()
A.30kcal/kg
B.40kcal/kg
C.50kcal/kg
D.60kcal/kg
E.70kcal/kg
There_____ a large number of students in the hall, and the number of the students_____ more than 3000.
A.is, is
B.is, are
C.are, is
D.are, are