电压串联负反馈能使放大器的()
A、输出电压稳定,输入电阻加大
B、输出电压稳定,输入电阻减小
C、输出电流稳定,输入电阻加大
D、输出电流稳定,输入电阻减小
参考答案:A
施工措施费如何计取?
"We’re not bringing in millions of dollars," says a director of development. "But we want to make sure the demand is there before we act to the project. "()
A. of
B. off
C. on
D. for