高频功率放大器主要工作在().
A.甲类
B.乙类
C.甲乙类
D.丙类
参考答案:D
Thanks to the good care of the nurses ,the boy is ______ recovering from his lung operation .
A.quietly
B.actually
C.practically
D.gradually
下列选项属于公安秘书人员知识结构中专业知识的是( )
A.新闻学
B.领导学
C.伦理学
D.咨询学