WTZJ-II型CIR送受话器中元件D2的1脚电压是（）。
A、+13.8V
B、+5V
C、-5V
D、GND
参考答案：A
One thing kept in our mind is ___ we would never forget to show our greatest appreciation for our loved and beloved ones．
A．when
B．that
C．what
D．how
芦荟
