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【简答题】
在等比级数传动系统中,总系统的转速范围与各变速组的变速范围有什么关系?与主轴的转速级数有什么关系?
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【简答题】完型填空。 I was very fond of hunting when I was a young man. In the autumn of 1915, I was 1 in the northwest of India. One evening, after hunting in the forest all 2 , I was returning alone to the place w...
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【简答题】完型填空。 I once found out that doing a favor for someone could get you into trouble.I was in the eighth grade at the time,and we were having a final test.During the test,the girl next to me __ 1 __someth...
【简答题】完型填空。 I was very fond of hunting when I was a young man. In the autumn of 1915, I was 1 in the northwest of India. One evening, after hunting in the forest all 2 , I was returning alone to the place w...
【简答题】目标成本管理是以（）为依据。
【单选题】当线圈加有效值为 100V 的交流电压时,电流有效值为 2A ,有功功率为 120W ,则线圈的电路模型为( )。
A.
30 W 电阻与 40 W 感抗串联
B.
40 W 电阻与 30 W 感抗串联
C.
0.012 W 电阻和 0.016 W 感抗串联
【简答题】一线圈加30V直流电压时，消耗功率P1=100W，当加有效值为220V的交流电压时，消耗功率P 2 =3059W，求该线圈的电抗多少Ω。
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