成本法是先分别求取估价对象在估价作业日期的重新购建价格和折旧，然后将重新购建价格减去折旧来求取估价对象价值的方法。( )
参考答案：错
在括号里填上适当的质数．
①8=______+______
②12=______+______+______
③15=______+______
④18=______+______+______
⑤24=______+______=______+______=______+______．
What _____ you _____ from 6:30 to 8:30 yesterday evening? [ ]
A. were; doing
B. was; doing
C. did; do
D. have; done
