刑罚是指掌握 * * 的统治阶级用以惩罚犯罪的一种强制办法。 ( )
参考答案：对
— Which book could I take?
— Oh, you can take ____ of them. I'll keep none. [ ]
A．all
B．both
C．neither
D．either
电流流过试件或中心导体产生（）磁化场
