如果商品缺乏弹性，如果要扩大销售收入，则要提高价格。
参考答案：对
回流比增大可以提高精馏塔顶产品的质量。
A cashier mentally reversed the digits of one customer’s correct amount of change and thus gave the customer art incorrect amount of change. If the cash register contained 45 cents more than it should have as a result of this error, which of the following could have been the correct amount of change in cents ？（）
A．14
B．45
C．54
D．65
E．83
