A <img width="82" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20220116233354_1627.jpg" /> B <img width="229" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20220116233355_7076.jpg" /> C 1一变动成本率 D <img width="124" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20220116233356_2701.jpg" /> E <img width="124" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20220116233357_8014.jpg" />