【单选题】以下关于退磁的叙述,正确的是()。
D.
当剩磁对以后的加工或使用有影响时才需进行退磁
【简答题】He stayed in Beijing for four days. → did he stay in Beijing?
【单选题】52以下关于退磁的叙述,哪一条是正确的:
B.
纵向磁化的剩磁化比周向磁化的剩磁更难彻底退干净
【单选题】以下关于退磁的叙述,哪条是正确的?
B.
纵向磁化的剩磁比周向磁化的剩磁更难彻底退干净
【简答题】He stayed in Beijing for four days . 改为: did he stay in Beijing?
【单选题】以下关于退磁的叙述,正确的是:
D.
当剩磁对以后的加工或使用有影响时才需进行退磁
【单选题】What does Mike mean?
A.
He likes both Beijing and New York.
B.
He likes neither Beijing nor New York.
C.
He likes Beijing, but he doesn't like New York.