某学校月初时电能表显示的数据为4321.5度，已知该学校本月用电53.6度，则月末时电能表显示应为
Lisa,could you tell me________yesterday? [ ]
A. what the teacher said
B. what did the teacher say
C. what will the teacher say
D. what the teacher will say
按照分步法计算产品成本，如果企业只生产一种产品，则成本计算对象是该种产品及其所经过的各个生产步骤。( )
