单项选择题

企业去年生产某亏损产品的贡献边际3000元，固定成本是1000元，假定今年其他条件不变，但生产该产品的设备可对外出租，一年的增加收入为（ ）元时，应停产该种产品。 A. 2001 B. 3100 C. 1999 D. 2900

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What does the author mean by saying that we may learn moral principles 'the hard way'?A.We reevaluate our previously held beliefs as we grow older.B.We refute some moral principles only after we find them inconsistent.C.We acquire a sense of right and wrong from real life lessons.D.We act by ignoring our inherited altruistic tendencies.
A.We
B.
B.We
C.
C.We
D.
D.We
单项选择题
右心衰竭主要导致下列器官瘀血 A. 肺，肝，胃肠道 B. 肺，脑，胃肠道 C. 肝，脾，胃肠道 D. 肾，肺，胃肠道
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