如图所示,一个单匝矩形线圈水平放在桌面上,再线圈中心上方有一竖直的条形磁体,此时线圈内的磁通量为0.05Wb.在0.5s的时间内,将该条形磁体从图示位置竖放到线圈内的桌面上,此时线圈内的磁通量为0.10Wb.试求此过程:
照明电路的电压为220伏。对人体来说,一般情况下36伏以下是安全;通过电流等于1毫安时会引起麻感觉;通过电流等于30毫安时有生命危险,根据以上数据,估计普通人体电阻最接近于( )
①Do you like the red hat? ____ A. He is under the tree.
②Where's the old man? ____ B. No, they aren't.
③How is the lion? ____ C. No, I don't.
④Are they tigers? ____ D. Yes, it is.
⑤Is this a kite?____ E. It is very strong.