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【单选题】
( )是有功功率P和视在功率S的比值。
A.
tgφ
B.
ctgφ
C.
sinφ
D.
cosφ
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参考解析：
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皮皮学刷刷变学霸
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【单选题】应激与适应学说中的第三线防卫是指
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【多选题】以下哪些属于多阶段决策的要素( )。
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【单选题】What does David Acheson think about the mandatory program?
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【简答题】You are a local guide. When you are in a scenic spot with your group, some Chinese students want to take a photo with your tourists.(在景点时,一些中国学生想和团队游客拍照。你和游客对话) Your dialogue with one of your tourists...
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【单选题】What does David Acheson think about the mandatory program?
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He has some doubts about whether it will have an impact.
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