Written in a hurry, _______. How can it be satisfactory?[      ]

A. they found many mistakes in the report

B. Sam made lots of mistakes in the report

C. there are plenty of mistakes in the report      

D. the report is full of mistakes

《煤矿安全质量标准化基本要求及评分方法（试行）》执行说明中，通过修理，虽能恢复精度和性能、但是一次修理费用超过重置价值（），不如更新经济的可以报废更新。

A.70%

B.75%

C.80%

D.85%