某厂去年计划产值80万元,实际增产20万元.实际比计划增产百分之几?
答:20÷80=25%;
答:实际比计划增产25%.
I cleaned my classroom ______. [ ]
A. with three hours
B. three hours ago
C. in three hours
D. three hours before
饭店服务质量有哪些特点?