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弗洛伊德发现快乐原则与生俱来，形成于婴儿期，也是自我遵循的唯一原则。
A、正确
B、错误

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Only then__________that she had made a mistake.
A.sherealized
B.didsherealize
C.hadsherealized
D.shehadrealized
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为获得同样的经纱密度，筘号越大，则每筘穿入数应该越大。
A、正确
B、错误
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A company produces and sells a single product whose variable cost is 2 per unit. The current selling price is $10 per unit. How much profit is made under marginal costing if the company sells 250,000 units?
A．$500,000
B．$600,000
C．$900,000
D．$1,000,000
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