判断题

干燥金属餐具可以在微波炉中消毒。

答案：错误

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单项选择题

What would happen to the equilibrium price and quantity of bananas if the wages of banana pickers fell and the price of apples fell?

A．would fall, and the effect on quantity would be ambiguous.
B．Price would rise, and the effect on quantity would be ambiguous.
C．Quantity would fall, and the effect on price would be ambiguous.
D．Quantity would rise, and the effect on price would be ambiguous.

单项选择题

集合R与S的"并"表示为_______