关联参考方向下欧姆定律可以用U=-IR来计算。
A. 对
B. 错
两个标明220V、100W的白炽灯泡,若分别接在250V和110V电源上,消耗的功率各是多少?
Constructionism learning theories emphasizes ( ) of learning.
A. abstract and structure
B. situation and structure
C. abstract and non-structure
D. situation and non-structure
( ) is a class learning form that is beneficial for peer relationship improvement and social development.
A. discovery learning
B. competition learning
C. individual learning
D. cooperative learning
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