单项选择题Computer systems consist of two very different types of elements:Hardware, which includes all the physical things that can be touched and (71) ,which tells the hardware how to do.
单项选择题某公司下设4个分公司A、B、C、D,上月各分公司的销售额及其在总公司所占比例如下表所示。由于此表单受潮,有些数据看不清了,但还可以推算出来。根据推算,D公司上月的销售额为(68)万元。()
A.50 B.100 C.150 D.200