——When did you buy this computer? It looks so new.——I it for only a couple of days. My sister bought it for me as a birthday present.
A：bought
B：have bought
C：have had
D：had
A型
B型
价格（万元/台）
12
10
月污水处理能力（吨/月）
200
160
经预算，企业最多支出89万元购买设备，且要求月处理污水能力不低于1380吨．设购买A种型号的污水处理设备x台，可列不等式组____．
﹣1 12 ，0，4，﹣3，2.5．
