【单选题】Object-based logical models are used for describing data ( ) the conceptual and view levels.
【单选题】用THCl/NaOH =0.004000g/ml HCI溶液滴定NaOH终点时消耗HCl20.00ml试样中含NaOH的质量为:
【多选题】Which of the following models can be used to describe object-based logical models?
B.
entity-relationship model
【单选题】用THCl/NaOH =0.004000g/mLHCI溶液滴定NaOH终点时消耗HCl20.00mL试样中含NaOH的质量为( )。