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单项选择题

A market demand curve shows ______.
A、the relationship between price and the number of buyers in a market
B、how quantity demanded changes when the number of sellers changes
C、the sum of all prices that individual buyers are willing and able to pay for each possible quantity of the good
D、how much of a good all buyers are willing and able to buy at each possible price

问答题

中空吹塑成型可分                、                  、                 、 多次吹塑成型和片材吹塑成型五种。