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【简答题】
目前葡萄球菌对青霉素的耐药性已达( )
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皮皮学刷刷变学霸
举一反三
【单选题】Suppose the marginal cost curve in the short run first decreases and then increases. If marginal cost is decreasing, _____ must be _____ and _____ must be _____.
A.
. marginal product; increasing; average fixed cost; decreasing
B.
. average variable cost; decreasing; average fixed cost; increasing
C.
. average total cost; increasing; marginal cost; decreasing
D.
. marginal product; increasing; average variable cost; decreasing