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单项选择题

初治肺结核患者应在治疗满2、5、6月时、复治肺结核患者在治疗满2、5、8月时均需复查痰涂片和培养，复查的肺结核患者应收集（）痰标本

A.即时痰
B．夜间痰
C．清晨痰
D．夜间痰+清晨痰+即时痰
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未知题型
Use a graph to demonstrate the circumstances that would prevail in a competitive market where firms are earning economic profits. Can this scenario be maintained in the long run? Explain your answer.
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A、贫血程度与出血量成正比
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C、严重者可发生DIC
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Which of the following would not shift the supply curve for mp3 players?
A、an increase in the price of mp3 players
B、a decrease in the number of sellers of mp3 players
C、an increase in the price of plastic, an input into the production of mp3 players
D、an improvement in the technology used to produce mp3 players
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