题目内容

According to the lecture, positive relationships are important for good health. If you have supportive, loving relationships you are more likely to feel happy and satisfied with your life.

A. 对
B. 错

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p28-1.5.1在图中负载增加是指()

A. 负载电阻R增加
B. 负载电流增加
C. 电源端电压啊U增加

P28-1.5.2

A. 4.6
B. 2.2
C. 4.4

P29-1.5.3

A. 100W
B. 50W
C. 25W

P29-1.5.4

A. 能正常工作
B. 100W的灯丝烧毁
C. 40W的灯丝烧毁

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