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【单选题】
对额定电压为 380 伏,功率 3 千瓦及 3 千瓦以上电动机作耐压试验时,试验电压应取( )。
A.
500
B.
1000
C.
1500
D.
1760
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A.
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B.
小心谨慎
C.
美貌多情
D.
体弱多病
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A.
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C.
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【单选题】统计分组的结果表现为 ( )
A.
组内同质性,组间同质性
B.
组内同质性,组间差异性
C.
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D.
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