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当高压输电线断裂落地时,人或兽走入断线点()M以内的电场时,由于前后脚之间有较高的电位差就会引起触电,把这种触电称为跨步触电。A、5B、8C、10D、20...
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积分环节的特征参数有:积分时间Ti和()。A、积分速度B、积分变量C、比例系数D、比例变量...
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当组成热电偶的材料A.B定了以后,则温度的上升对下面现象无影响的...
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阀芯结构成圆球形状、流体从贯通圆球中心的通孔中流过,这种结构的阀...
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在同一电源电压下,三相对称负载作三角形或星形联接时,其总功率的数...
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STEP7通常有四种指令寻址方式,分别是立即寻址、存贮器直接寻址...
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