A:电磁铁的上端为S极
B:电源左端为+极
C:抽去铁芯,弹簧测力计示数增大
D:断开开关,弹簧测力计示数为零
根据科学家预测,原始生命诞生于( )
—Yes. ____ the way, he is a Japanese, not a Chinese.