多项选择题

如图所示，元件N 吸收功率P = -5 W时，下列表述正确的是： ( )

A、i 与v 是关联参考方向

B、N 实际吸收功率为5W

C、N 实际放出功率为5W

D、当电流i =1A时，电压v =5V

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The author depicts living conditions of the men in his childhood and makes clear his view point that men carried burdens of hard labor.

答案：正确

多项选择题

下列单糖中哪些是酮糖？（　　）
A、核糖
B、核酮糖
C、葡萄糖
D、果糖