题目内容
Eighteen-year-old Jewish children will be responsible for all their behaviors and are treated as an adult.
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Chinese believe that when people die, their body turns to dust and ashes and the soul goes up to heaven.
Chinese culture and western culture have contrasting views on time.
一载有电流I的细导线分别均匀密绕在半径为R和r的长直圆筒上形成两个螺线管，两螺线管单位长度上的匝数相等．设R = 2r，则两螺线管中的磁感强度大小BR和Br满足
一台他励直流电动机，PN=5.6KW，UN=220V，IN=31A，nN=1000r/min，Ra=0.4W，负载转矩 TL=49 N·m，电枢电流不得超过2倍额定电流。试计算：(略T0）电动机拖动反抗性负载，采用能耗制动停车，电枢回路应串入的制动电阻最小值是多少？
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