Scientists have decided to declare ____ war on AIDS in order to make ____ breakthrough in treating it.

A．a, a

B．/, a

C．a, the

D．/ , the

数字温度表可将测量信号转换成（）信号，再将其线性地转换为数字信号，以实现数字显示。

A、直流电压

B、直流电流

C、电阻

D、差压