I think whoever makes      contributions to the company than the others should get      income.

A．greater; a highest

B．more greater; a higher

C．greater; the highest

D．more greater; the higher

若反馈到输入端的是交流量，称为交流反馈，它能改善（）的性能。

A、直流通路

B、交流通路

C、直流电路

D、交流电路