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【单选题】
下列变量中属于电能质量指标的是A.
电流
B.
频率
C.
功率
D.
阻抗
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反馈参考答案：
举一反三
【简答题】( )与 ( ) 合称为肋。人体共有 ( ) 对肋。 1-7对为 ( ) , 8-10对为 ( ) , 11-12对为 ( ) 。
【单选题】Those students don't have to be made ______. They are all diligent students.
A.
learn
B.
learned
C.
learning
D.
to learn
【单选题】This school doesn't have ______ it did ten years ago. [ ]
A.
so many students as
B.
many as students as
C.
such few students as
D.
so many as students as
【简答题】2018年我国原油进口依存度 %，天然气为45.3%，铀进口依存度已达90%。
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