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【判断题】
对称三相电路有功功率的计算公式为 P= U L I L cosφ,其中φ对于星形联结,是指相电压与相电流之间的相位差;对于三角形联结,则是指线电压与线电流之间的相位差。 ( )A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】At the time when their parents were young, a lot of modern necessary equipment owned by young people now was regarded as ______.
【单选题】The time when a lot of people are travelling to or from work and so roads and trains are very busy
A.
Rush hour
B.
toll
【单选题】Even when he was a boy, the author spent a lot of time practicing writing because
A.
becoming a professional writer was his goal.
B.
he had something secret in his heart.
C.
learning to write was his childhood dream.
D.
people blamed him for his laziness.
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