多极放大器就是()。
A.由多个单级放大器组成的放大器
B.由多个三极管组成的放大器
参考答案:A
Nowadays students go to key universities just for a formal , which may help them hunt for a
suitable job in the future.[ ]
A. conservation
B. preparation
C. graduation
D. qualification
培训项目设计种可以通过()等方法获取信息,确立培训目标