对汽车零件采用直流电磁化探伤后，零件上会多少留有剩磁，最好采用（）退磁。
A.交流电
B.直流电
C.交、直流电均可
D.加热
参考答案：B
The government tried its best to ______ the people's needs, but the people were still not _______ .
In fact, what the government did was not _______. [ ]
A. satisfy; satisfied; satisfying
B. satisfy; satisfying; satisfied
C. satisfied; satisfied; satisfying
D. satisfying;satisfied; satisfied
下列哪些是储粮的原则（）。
A.科学保粮
B.谁坏粮、谁担责
C.谁储粮、谁负责
D.预防为主、综合防治
