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【多选题】
关于变压器的有功损耗，下列叙述（）是正确的。A.
变压器的有功损耗包括铁损和铜损
B.
铁损的数值与变压器铁芯材质有关，且与变压器负荷电流成正比
C.
负载电流为额定值时的铜损又称短路损失
D.
铜损与负荷电流平方成正比
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反馈参考答案：
举一反三
【简答题】Watch the video and answer the following questions. 1. What's the building that was hit?
【简答题】Watch the video clip and try to answer the following questions: 1. What are these women’s reaction? 2. What is the theme of this video clip?
【简答题】Model 2: How are you doing? 1. Watch the video and fill in the blanks.
【简答题】Watch Video 1 and complete the following mind map.【图片】【图片】 1. _______________
【单选题】Read the text below the video. Then watch the video. Read each question and choose the correct answer. 1. Susan Wu is __________.
A.
Laura's friend
B.
a new co-worker
C.
Laura's sister
【简答题】Watch the video clip and answer the
questions. 1.
According to the video clip, which city is the greenest one in Asia?
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