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【判断题】
电阻、电感、电容相串联的正弦交流电路中,复阻抗Z=R+j(XL-XC)。
【判断题】
电阻、电感相并联的正弦交流电路中,复阻抗Z=R-jXC。
【判断题】
正弦交流电路中,电阻元件的阻抗|z|=R,与频率无关。
【判断题】
R-L-C串联电路发生谐振时,电路的阻抗|Z|=R,UL=UC。
【单选题】
已知在R、L串联的正弦交流电路中,总电压U=30V,L上的电压UL =18V,则R上的电压UR =( )。
【单选题】
某电容C与电阻R串联,其串联等效阻抗|Z|=10Ω,已知容抗Xc=7.07Ω,则电阻R为( )。
【判断题】
R、L、C串联电路中,若复阻抗虚部小于零时,电路呈感性。
【判断题】
R、L、C串联电路中,电路复阻抗虚部大于零时,电路呈容性。
【判断题】
相量分析法把正弦交流电路用相量模型来表示,其中正弦量用相量代替,R、L、C电路参数用对应的复阻抗表示。
【多选题】
图板不用时如何放置?
①
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随意放置
②
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水平放置
③
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垂直放置
④
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倾斜放置
【多选题】
简述正棱柱的作图步骤,写出作图顺序。1.作底面最能反映形状、特征的图形2.作立体最能反映形状、特征的图形3.作侧面的投影,可简化为作侧棱的投影4.作底面另两面的投影
【判断题】
正棱柱的顶面、底面为正多边形,侧面与顶、底面垂直
【单选题】
轴线垂直H面的圆柱,被正垂面截切,截交线的空间形状为( )。
【单选题】
带切口圆柱三视图正确的是<img src="https://file.icve.com.cn/ssykt/293/762/494BE9F27082F46369578F5E39161411.png"/>
①
<img src="https://file.icve.com.cn/ssykt/92/317/1734F413C584333E8D80BAE982C46850.png">
②
<img src="https://file.icve.com.cn/ssykt/943/633/EBE9E622E94B514C96E5A7F7C92EB4EB.png">
③
<img src="https://file.icve.com.cn/ssykt/312/811/4E2CAD5B3A1BD8950DDC8F573CA1A520.png">
④
<img src="https://file.icve.com.cn/ssykt/928/493/E807B7041A6F8E141A463904A473D616.png">
【判断题】
平面倾斜于圆柱底面截切圆柱,截交线为圆。
【判断题】
平面垂直于圆柱底面截切圆柱,截交线为长方形。
【单选题】
尺寸界限用()绘制。
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粗实线
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细
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实线
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点划线
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虚线